Currently Being ModeratedFeb 18, 2013 1:42 PM (in response to rallen56)
May be a '.plist" problem.
Close all applications.
In Finder hold the option key down click the "Go" menu in the menu bar.
Select "Library" from the dropdown.
Librarry > Preferences
Look for these two files.
Delete them. Restart the computer.
Try App store.