My Personalize Window Flashes Me!

Nasty little bugger!:p

When I right click on the desktop and click personalize, the personalize window pops up for a millisecond and goes away. This started happening after I uninstalled a program. I have also noticed the the personalize icon in the welcome window is now a plain folder. Looks like something - a .dll or whatnot - got corrupted or accidentally deleted, but I don’t know what. If I knew what it was, I would be able to copy the offending file from another install. Anybody able to help me on this one?