Extreme GPU temperatures XBMCubuntu fresh install

Hi

I just installed my HTPC (http://www.zotacusa.com/zbox-giga-id70-plus.html) with the latest Xbmcbuntu ( xbmcbuntu-12.00.Intel-NVIDIA.iso)

Everything works fine but then I noticed that the gpu temperature is 110celsius!!!!!! Cpu is around 50-60celsius

The airflow is ok and there is no dust. I can hear all of the fans so they work.

I tried to find something here on the forum about the problem but could find anything. When I try to exit XBMC it just reboots. If i try shutdown or reboot. Then it just freezes in the menu. Can it be a Nvidia driver problem? Is there a gpu fan management system for xbmcbuntu?

Please help me before I burn my HTPC

Thanks
Iscar1ot