CPU Shows 100% usage

CaptAli

Reputable
Mar 30, 2014
35
0
4,540
Hi guys!
I recently change my Kingston RAM 2*(1GB) DDR2, to 2*(2GB) Kingston DDR2. That was coz pc was failing booting up, and the problem now is everything works fine, but CPU usage shows 89% usage even thought no app is running.
Do you guys think it's coz of the thermal paste?
Or what could be the reason?
or im just panicking?