Multiple Windows users 10 report suddenly unable to use ALT codes. While some users have problems with several different ALT codes, some users can't use them at all. In most cases, the output is exactly the same character regardless of the alt code that is entered. For most problems, the onset of this problem appears to be abrupt and started to occur without an apparent trigger. Turns out the problem is unique to Windows 10, as we found no reports of the problem occurring in older versions of Windows.

What is causing ALT codes to stop working in Windows 10?
We investigated this by looking at various user reports and looking at the most popular fixes that affected users have implemented to resolve the issue.. It turns out that this particular problem can arise from several different causes. Here is a list of causes that could lead to the ALT codes problem:
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Mouse keys do not work when NumLock is enabled: one of the most common causes of this error is cases where the use of mouse keys is not allowed when NumLock is enabled. If this scenario is applicable, You can solve the problem by changing the default behavior so that the mouse keys are on when the Numlock key is on.
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Unicode entry is not enabled through Registry Editor: your Registry may contain a specific key that prevents Unicode characters from being added via Alt keys. In this case, you can solve the problem by adding an extra string value to the input method key.
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Third party interference: It turns out that there are certain Voice over IP applications known to cause this behavior. Whisper and Discord are two applications that are commonly reported to cause this problem.. Several users who encountered this problem while one of these applications was installed have reported that the problem was only resolved after permanently uninstalling.
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The special character registry is corrupted: on rare occasions, this problem can also be caused by an inconsistency with the registry that keeps track of all ALT characters. If this scenario is applicable, it should be possible to work around the problem by using Character Map to add special characters. What's more, you may consider third party alternatives like Sharpkeys or Keytweak
If you are currently looking for solutions capable of resolving this error message, this article will list several different troubleshooting guides that can help you fix the problem. Then, you will discover several different possible solutions that other users in a similar situation have used successfully to solve the problem.
For best results, We recommend that you follow the following methods in the same order as they are presented (we have classified them by efficiency and severity). Over time, you will find a possible solution that will allow you to solve the problem, regardless of the culprit that is causing it.
Let us begin!
Method 1: enable mouse keys when number lock is on
If you only run into this problem when you try to use ALT codes with the numeric keypad, it is almost always because you need to enable a mouse option in the menu for easy access.
Several Windows users struggling to resolve the same issue have reported that the issue was fully resolved after accessing the mouse tab of the Ease of Access menu and enabling the option 'Use mouse keys when number lock is on'. activated”.
However, if you also run into the same problems even when using the normal number keys, this option will not solve the problem.
If you think this method may apply to you, Follow the instructions below to access the Ease of Access settings and make any necessary modifications:
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Press the window key + R to open a Run dialog. Then, scribe $ 0027 ms-settings: easyofaccess-mouse $ 0027 and press Enter to open the Mouse tab of the Ease of Access menu.
Ease of Access Mouse Menu
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Once you get to the right menu, go to the right section of the screen and enable the key associated with Turn on the mouse keys to use the numeric keypad to move the mouse pointer $ 0027.
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After doing this, you will see a couple of additional options appear. Ignore the rest and make sure the switch associated with Only use mouse keys when Num Lock is on is on.
Activation of the switch associated with $ 0027 Use only mouse keys when Num Lock is on $ 0027
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Once the above option is enabled, restart the computer and see if the problem is resolved on the next system startup by trying to use the ALT codes once more.
If the same problem continues to occur, proceed to the next method below.
Method 2: enable input of all Unicode characters via Regedit
If method one did not allow you to solve the problem, another way to solve it is to make sure you enable the input of all Unicode characters by code. This can be achieved by adding a string value to the input method key using Registry Editor.
After making this modification, you can enter any ALT character by holding down the Alt key, pressing the numeric keypad and entering the hex code. Several affected users have confirmed that this method allowed them to correct the functionality of the ALT key in Windows 10.
Here is a quick guide to enable input of all Unicode characters using Registry Editor:
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Press the Windows key + R to open the Run dialog. Later, scribe “regedit” in the text box and press Enter to open the Registry Editor. When prompted UAC (User account control), click Yes to grant administrator privileges.
Run Registry Editor
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Once you are inside the Registry Editor, use the left panel to navigate to the next location:
HKEY_CURRENT_USERNPANEL CONTROLN-Input method
Note: What's more, you can paste the location directly into the navigation bar and hit Enter to get instantly.
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Later, right-click on Input Method (from the left panel) and choose New> String value.
Creating a new string value inside the input method key
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Name EnableHexNumpad to value of newly created string. Then double click on it from the right side panel and set its value data to 1 and click OK.
Assign the correct value to the EnableHexNumpad string
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Close Registry Editor, restart your computer and wait for the next boot to complete for the changes to take effect.
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To enter a character, hold down the Alt key and press the button + (on the numeric keypad). Then enter the hex code and release the Alt key to add the character.
If you still can't use the ALT characters, continue with next method.
Method 3: uninstall the jamming app (if appropriate)
It turns out that there are also several applications with the potential to suppress the use of the Alt keys. The reason for this is that they are kept open for a specific use. In most cases, The ALT key is used to activate or deactivate the push-to-talk function, which effectively interrupts the ability to use ALT characters.
Whisper is most commonly reported as the Voice over IP application causing this problem, but there are certainly others that will too.
Multiple Windows users 10 who were in an identical scenario have managed to solve the problem simply by uninstalling the application that was causing the interference.
Here is a step by step guide to uninstall the app that is causing the problem:
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Press the Windows key + R to open the Run dialog. Later, scribe “appwiz.cpl” in the text box and press Enter to open the Programs and Features menu.
Type appwiz.cpl and hit Enter to open the list of installed programs
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Inside the Programs and Features menu, scroll down the list of installed apps and locate the app that is causing the interference. Once i see it, right click on it and choose Uninstall from the context menu that just appeared.
Uninstall the application causing the interference
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Follow the instructions on the screen to complete the uninstallation., then restart your computer and see if the problem is resolved on the next system startup.
If the problem persists or the previous method was not applicable, go to next method.
Method 4: add ALT characters using character map
If none of the above methods worked for you, you should be able to use the ALT characters through the Character Map, but this process takes a little time. Several Windows users who have not been able to use ALT characters in a conventional way have reported that they have managed to solve the problem completely using the Character Map.
Here is a quick guide to add ALT characters using character map:
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Press the Windows key + R to open the Run dialog. Then write $ 0027charmap $ 0027 and hit Enter to open the character map.
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Once you are inside the character map, just scroll through the available fonts and click on a special character you want to insert.
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Then click the Select button to copy it to your clipboard.
Note: Notice that the key is also displayed in the lower right corner of the screen. Use it to check if you have entered the correct number combination.
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Use right click> get the ctrl + V to paste the special character you copied in step 3.

If this solution is not to your liking, proceed to the next method below to review some third party alternatives.
Method 5: use third-party alternatives
If none of the above methods have allowed you to restore normal Alt key functionality, you may want to consider a third party alternative. Several affected users have reported that they were finally able to use the ALT keys effectively using third-party programs such as Sharpkeys or Keytweak..
These third-party solutions will allow you to edit and reassign keys in a much easier way than doing it manually and getting lost in the official documentation..
A popular solution using these tools is to map the right control key to the left ALT key, to eliminate any interference caused by other functionalities that are assigned to the same key.
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Ease of Access Mouse Menu
Activation of the switch associated with $ 0027 Use only mouse keys when Num Lock is on $ 0027
Run Registry Editor
Creating a new string value inside the input method key
Assign the correct value to the EnableHexNumpad string
Type appwiz.cpl and hit Enter to open the list of installed programs
Uninstall the application causing the interference



