Intel 1155 stock cooler

It seems to be running with around 2200 rpm constantly

It seems that they share the same design:
http://hw-lab.com/lga-1155-and-lga-1156-share-the-same-...

I just dont know why it runs with such high RPM. I've even set it to silent mode, but that didnt help

the 1155/1556 mb have the same heat sink leg size. if you look on new egg the three sizes that intel brackets come in are 775/1155/1333. for the cpu fan speed if she has a msi mb or an older mb bios. look into the bios and look under cpu fan speed.
some have the fan speed set to auto and a min fan speed. most time the min fan speed is 1500-2000 rpm or they set the temp or fan speed to 50 percent. try setting it to 40c or 33 percent if you can. also check that the cpu fan plugged into the cpu fan header. some headers will cause the fan not to slow down.

if it not a bios setting it may be that you forgot to peel the cover off the thermal paste or the paste was old and dried out. most times if the temp is high it because the cpu plastic cooler legs are not down all the way and the cooler not fitting as tight as it needs to be.

Everything should be OK. I added new thermal paste and I cleaned the CPU and cooler before I applied it. I've gone into BIOS and changed the cooler settings in there. I connected the CPU cooler to the CPU socket on the motherboard as well.. I have no idea why it continues to get such high RPM.

mb model??? if it an asus make sure your not running in performace mode..overclocking mode...check the cpu voltage make sure it set to auto and not over clocked...to high of voltage..makes more heat...also check the c1 and c3 are on so the cpu can declock itself..turn off unused coress

Its a Asus P7P55D-E. It shouldnt be running OC mode since I've never OC'ed it, but I'll check when shes done installing Windows updates.

Okey, after installing Windows 7 updates it all of a sudden slowed down...

Dosent make sense in my world.

It runs kinda hot imo though. It goes from 50-55 in idle.

check the bios rev of the mb there a lot of patches for it.

Yeah I'm gonna give that a try tomorrow.
Thanks for your help so far