when surfing the internet my computer is given countdown and then restarted

[conor]

I am using windows xp, my isp is BT Openworld. When I
connect to the internet for aprox a minuite and a half,
an error message is diplayed giving me a 60 second
countdown and then restarts my computer. Apparently its
to down with a missing patch in xp and needs some sort of
windows update. I have no time to stay on the internet in
order to find it! and solutions?

 

[bb]

You have the Blaster virus.
The restart can be disabled, but if you dont know what you are doing,
better to buy norton anti virus.
bb