Sorry about the post in the wrong forum, I'm new in this kind of stuff and I really didn't know where to put...
Well, I had to format the pc because of an error related to other thing, so I know that all nvidia stuff that could still be in the pc are gone.
My motherboard is an ASUS P5K SE (is this the correct name?)
The power supply in an Eurotech 420w power suply
Processor: Intel Core 2 Duo 2200 2.2Ghz
4 GB RAM DIMM
and im Using Windows 7 Ultimate Service pack 1
I also noticed that my PC have DirectX11 installed, but my graphic card can only handle with DX10.1... Can it be related to this?