You really haven't given us the necessary details to help you out.
What program are you using that you think freezes it? Where/when do you see/get this message? Is your anti-virus program up to date, running?
HP COMPAC PRESARIO model # SR5614F Vista Home Premium IE7
I get an error message "not responding" and my computer freezes.
Most of the time it reverts to either HOME PAGE or GOOGLE. I find i happens on almost all sites except Windows Mail