how can i check the temp of my cpu

by pressing the delete key just after you turn on your computer... turn your pc on, and keep pressing the delete key until a big blue screen comes up :) Dont change any settings in there though! However you will find a hardware moniter tab/section in there.

thanks a lot! is there a way i can do it while my computer is running?

It depends on your motherboard, but download Motherboard Moniter and install it. You should be able to get the readings using that program :)

the new version of MBM comes with a configuration wizard that sets everything up (provided that your mobo is compatible with MBM). just pick your motherboard model and the program takes care of the rest.