Windows doesn't it like it when you just move applications around. There are items in the registry that point to locations of files that are no longer valid. If you did the same thing to Word or Excel, you'd probably get lots of weird messages as well. What you should have done, was an uninstall and then reinstall to the different folder. You might be able to fix things now by using regedit and updating all of the paths. If you miss something, however, you might still have problems - especially when it's time to do an uninstall. The best thing to do might be to move everything back to the original location and do the uninstall. There are utility programs available to do the sort of move you did but all of the ones I know of have to be active before you do any
moving.