Broken piece that holds the heatsink tight on the CPU

Hey everyone,
I found the problem why my computer keeps freezing since the past weeeks, there is a broken part on the thing that attaches the FAN/Heatsink to the CPU so the whole thing is not holding tight. I noticed it when i was watching the temperatures in the BIOS, i would press on the heatsink to make it more tight on the CPU and that would greatly decrease the temperature. Now i am not a pro of fans and temperatures and all that stuff and i have no clue about what I have to do next. Do i have to buy a whole new heatsink/fan? Or just replace the broken piece? And where could I find that piece?
Thanks in advance!!
Simon

where's the broken piece?

Also, you didn't really say what kinda CPU you're using, and different ones have different breakable pieces.

Anyhow, if the broken piece did not come from the motherboard, buyign a new heatsink will solve your problem (or a new piece that you broke, but thats highly unlikely).

thx for the reply,

my cpu is a P4 2.66ghz and the actual broken piece is the mount for the heatsink/fan (one of the 4 clips that attaches the heatsink to the cpu).
I found a website where they sell the piece i need : http://www.centrix-intl.com/?DirectBuy=yes&ItemPartNumber=P4Retention-478 . I hope that will do the work

Simon

Should work if thats the broken piece