Resolving a mac virus... Help?

I’m about to re-install OS X on my macbook. I let a friend use it on another account, and he went to god knows where. Wherever he went, it put a bot on my computer in Samba, I think that attacks my router’s firewall from the inside.

Anywhoo, I’m thinking that I should blitz the OS, and restore my user account. I have time machine backups that I started right after all of this happened. I’ve kept the machine off any network since I found out about this.

Does time machine restore (on a re-install) have any options to restore just a user, or do I have to re-load the entire system from the backup? I would just as soon not have to re-load all of my settings again…

Or does anyone have any specialty in weeding out mac bots? I think I’ve got one…