try your prefetch folder...I'm assuming you're using winxp...go to run and enter prefetch in the field and press ok...this will tell what was recently run on your puter...hmmm...you can try a free program called
regseeker ...open the program and go to histories...it will list all the sites visited...unfortunately if your history has been deleted it maybe gone...maybe try an undelete program and see what happens...there is a way to prevent users from deleting history on your machine...
preventing complete history deletion ...