some thing is goin on with my pc

ok this is wierd , three days ago my computer got infected with a virus , basically it by itself installed an anitvirus and start scanning... i tried to get rid of it n it never allowd me to do any thing.
i thought my bro did something so i spent whole day , formated everything and reinstalled again.
now the next day after i faced same problem again ...the whole day i just played cf went to forum and watched cricket game online...(keping in mind i have been watchin the game online for the past 3 years now). i ignroed everything gave it benfit of doubt and reformated every thing .
believe me or not last night i faced again same problem........:( i spent whole night and formated again everything ... now starnge thing is that this day i only went to cf forums and played cf....
n now right now few minutes before i got lagged fps (my fps went down from 100 to 10 o.O during game) and quitted went to desktop and saw my norotn antivirus got corrupted and asked me to reinstall it again
now the question is wat is going on ...... is it a virus season.... is it only me ....n who is the source considering that i only went to cf forums and game and i never downloaded any thing wat so ever
any suggestions and help would be wonderful.........:)

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