Help me please

Recently after a friend had been using my pc my homepage had been changed from google to gophersearch, I have tried using internet tools and typing google as the homepage but every morning when i open IE it opens with gophersearch. How can i stop this happening?

Please post a hijackthis log for the experts to look at.
Please follow the instructions here and then post your log in a new thread of the Spyware, Adaware, Viruses and hijackthis logs section.
(Not in this section please.)

Please specify what issues you appear to be experiencing along with your log.

Can you explain your problem more clearly then i will show you the best solutions because i am also a web-developer....