A challenge to my fellow techies.

My g/f's comp gets massivly high pings in EVERY game known to man.
Where not talking 500 or 600 where talking 1000 - 2000....and that on a server that I get 150 from on my computer.
Her computer is only 3 months old so nothings dieing, only thing I can think of that might be auto-updating is norton AV, but I disable that from the task manager and ping still sucks.
This has been pissing me off to no end, ive tryed every tweak known to man + all my techy "secrets" that I've seen on the net.
Sumed up....Im stumped.
I would really appreciate ANY hints or tips anyone might have on what to do.
*sigh*
BTW please forgive the sucky spelling, I've been working all day and need sleep bad.

thanks in advance
Simo