All of a sudden whenever I try to access several of my control panels I get the following message: "Application not found" and then WinXP offers to let me open the applet with a choice of programs. Any ideas? I have some control panel applets, but not others. I can't tie this into anything. Thanks. This is now occurring after a clean install of WinXP Pro. Now I'm really lost. I have an identical system sitting next to it, same MB, processor, etc. and it is fine.