Whenever I click (left or right) on a menu like the Start menu or the Quick Launch menu, the menu suddenly closes, so that I can't open anything at all. Other menus seem to be fine, such as Firefox's right-click menu. This only started happening recently, in the middle of deleting some things off the Start menu's Programs folder. I'll also note that I'm using the Classic view for the Start menu at the moment. The new-y Vista Start menu is fine, but there's still the problem with the Quick Launch bar.
I'm running Windows Vista Home Premium SP1, 32-bit. Hopefully this isn't in the wrong subforum.