I sugest you invest in Mcafee anti-Virus.
They also have a good firewall program as well, also get Ad-Aware,

And by the sounds of it about the mbs sent and recieved that could just be normal activity, i thought i had a virus once, but after formatting my hard drives reinstalling everything. The same thing kept happening, and aparently it's normal, as your computer sends and recieves cookies.
And so the more places you go to the more your computer will recieve and send this sorta stuff, try deleting the files in your Temp internet folder, maybe this might help, and also check your cookie settings....

Anyhow i could be wrong, but i'm sure that someone else with more knowledge will be able to give you the exact clue.

Cheers.