Hello I need yout help to understand why i'm not able to install Windows 7 on my Workstation Precision t5400. I receive this error at the end of the installation "windows setup could not configure windows to run on this computer's hardware"

I had configured a RAID 1 Array on that workstation and i suspect that the problem is due to that but i'm not sure. Can someone help how to fix it??

Tanks GIovanni