Video problem

Hello,
I have a Pentium 4, 2.13 Ghz, 1 GB ram, 128MB video card.
I recently discovered that after some time a strange noise comes from my processor, something like a repeated click, especially when i watch a video on the internet or on my computer. I recently installed Core AVC that worked just fine to play 720p videos, but i week ago it started not to work ok anymore. When i watch an anime episode it plays smoothly up until around the half of the episode, then the noise starts again and it starts to lose the sync between video and sound. It will only work if i pause the video for around a minute. Also, i tried once to manually fan the processor and the noise stopped. Do you think i need a new processor?

Thanks,
Tzukimono