Follow Bal advise. It is the best. Try doing a full scan first. Second, you say other pcs can connect to internet and browse the web, are you sure yout pc is the only one affected? Have you change any browser settings, but i doubt it since all your browsers are affected. What have you been doing with your pc. Did you download any applications recently?
Subscribing to this thread. As Jingda said, And Bal, above.