My brother in law has a WinXP system. When he logs onto it as the Administrator it shows a message that says "Can't find 'C'"
If you hit the Okay button it disappears and everything runs fine.
I'm assuming that somewhere in the start programs the system is trying to call/start a program called "C", but as "C" doesn't exist it shows this message.
Exactly where do I find, in XP, where it is trying to call "C" so I can remove the entry and hopefully it will go away.