Hi, I hope somone out there can help. I've been looking through the forums for a while and I haven't found a solution to my problem. First of all I'm running Windows 7 Pro 64 bit on an i5 system. I powered on my PC and it gave me a warning about the machine not being shut down properly. I started windows normally and once I reached the desktop Windows freezes, I can still move the cursor but I can't click on anything. Pressing Ctrl alt Del only causes a black screen to appear and I am forced to reset the machine. Unfortunately I haven't set up any system restore points. I tried running a memory diagnostic with the Windows 7 CD but to no avail. Serching for problems using the Windows 7 disk turns up nothing aswell. I started windows in safe mode and disabled all programs at startup. After rebooting in normal mode the same thing happened, it freezes just as before. I installed Windows 7 on a different hard drive partition and it works fine so I'm pretty sure it's not a hardware issue. Can anyone tell me what I can do to troubleshoot this problem? How do I go about testing which program may be causing the problem? Is there anyway I can try and repair windows files? I would be really grateful for any help. Thanks in advance.