This is one of Adobe's most annoying problems, where you do not know what is happening since the problem does not produce any error, it just closes when you try to directly open the Adobe Reader or any of the pdf files that are supposed to open with Adobe Reader.
The reason it happens is when Adobe thinks you have not accepted their terms of use. To solve the problem, you will need to run the Eula.exe application from the Adobe folder and accept the license terms. On Windows computers 7, the folder you should consult is
Once you are in the Adobe folder, click Reader (your version), open the Reader folder and locate the Eula.exe file. Double click the Eula.exe file and click Accept to accept the license terms. Your Adobe Reader should now open fine.
