My (bosses) homepage keeps redirecting to about:blank. I have run hijackthis, cwshredder, adaware, spybot (all updated before running). I can get it to go away but it always comes back. I get very little time on his PC to troubleshoot and it always comes back when I'm not around so I can't pinpoint if it is coming back on it's own which would lead me to believe that it is somewhere on his PC or if he keeps hitting infected websites or popups. I have been trying to infect my own PC so that I can troubleshoot better but I have had no luck.