Ok, I've tried too many things already, I'll try to see if I can find a solution here.
I have a Dell XPS M140 laptop. Few weeks ago, for some reason the cooling fan turned on, and never stopped and it was making the computer extremely slow. Downloaded Speedfan to check temps, CPU was 85C, HDD 38C, googled and found that those temps are ok for it.
So I did a "PC Restore" the Dell utility to bring the PC to the status in which it was shipped. Didn't fix it. Fan still going full speed. Cleaned the fan, nothing. Replaced it with a "new/refurbished" one, still nothing. So then I got a cheap cooling pad, and that is keeping the temps low, but even though the whole browsing is normal speed, anytime I wanna watch a YouTube video, or use Windows Media Player for a video or song, it is just painfully slow.
I got the updated video and chipset drivers from the Dell website, and installed "K-lite Codec Pack". Still super-slow.
I ran out of ideas and google is not giving me anything else.
Also ran Antivirus on boot, and found nothing.
Any help here?
P.S.: I forgot to mention that the CPU is definitely overheating, but the cooling pad keeps the temp ok, the browsing is fine, just the video playback.