i have the same problem as gbear:
"yahoo goes to about:blank, http://www.daniweb.com/techtalkforum...t%3Ablank.html"
But when i go to the first link you provided it works for a bit and then a messages comes up saying there have been a problem in internet explorer and then it works for a while longer and then freezes so i can't do anything - is there any way i can get the computer back to normal

Hi a.reynolds, we request that a new thread be started regardless of how similar a problem is, so I've split your post into a new thread.

Please get Hijackthis from here:
http://www.merijn.org/files/hijackthis_sfx.exe

Close all browser windows, scan with HJT, and post the log in this thread.