Create a new user account and try using that in order to determine if the problem is due to your user environment or if the problem is system-wide. If it does not occur with the new user, clear your regular user settings:
rd /s /q %USERPROFILE%\AppData\Local\Microsoft\VisualStudio
rd /s /q %USERPROFILE%\AppData\Local\Microsoft\VSCommon
rd /s /q %USERPROFILE%\AppData\Roaming\Microsoft\VisualStudio
(for XP, substitute "Local Settings" and "Application Data" for "AppData\Local" and "AppData\Roaming")
Windows Registry Editor Version 5.00
[-HKEY_CURRENT_USER\Software\Microsoft\VisualStudio]
[-HKEY_CURRENT_USER\Software\Microsoft\VSCommon]