Hello.. i am facing a problem since past weak..i m using windows xp on my D600 1.6gh 512mb RAM for many years..just i have replaced its mother board from a mechanic and it has been working fine for a month...but now its CPU usage most of the time remains at 100% specially when i play videos not only HD but low quality too then my mouse nd everything gets v slow and CPU shots to 100..i have reinstalled windows xp for a couple of times and i have done its cleaning via bit defender but no threat found...but the prob persists...then again i reinstalled XP nd without installing any software i installed spypot and scanned my pc no threat found again....system is slow as if 100s of applications are installed in it...i played video in youtube as well same happens there as well...my mouse movements gets very slow...even when i donot play video CPU usage keep on varry btw 60 and 100...plz guide me wt to do
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