my pc is new, spec is good, but i keep getting this strange thing where everything freezes for about 10-15 seconds and i cant do anything. happens every hour or so, or quite a lot when i play a game for the first hour, then seems to stop. this leads me to believe i have a virus. ive run ewido, ad-aware, AVG and a-squared, all free versions only, which dont seem to have cleared the problem. i dont have a firewall. some advice much appreciated. i'll buy a virus checker if theres a particularly good one, price isnt that much of a problem, if its worth getting