Wrong section maybe but everyone is here in whoreslounge

OK.. my computer loads up and its fine.. clicc on my account and nothing pops up.. just the bacc Ground.. no start menu.. no icons.. to access the internet i have to Ctrl Atl Delete and go to the new task and type in firefox.. anybody got any help on how to fix this.. last time it did this was when my little cousin was on it while i was out of town.. i cleared my prefetch and it was fine.. now this time i cant even get to my prefetch because my start menu wont show up... any help is appreciated.. i'm on windows xp