Hi MollyMidnight,
This is usually due to some kind of permissions issue. Are you on Windows or Mac?
It recommend creating a new local administrative account and running the software from there and see if the behavior persists.
Windows 7 - http://windows.microsoft.com/en-IN/windows7/Create-a-user-account
Windows 8 - http://windows.microsoft.com/en-IN/windows-8/create-user-account
Mac 10.7 - http://support.apple.com/kb/PH4600
Mac 10.8 - http://support.apple.com/kb/PH11468
-Dave