Yestarday, I decided to give my system a decent cleaning with compressed air. It had been a while and there was a decent amount of dust buildup in the heatsink and fans. Enough to make a shirt out of. It was fairly bad. But the machine still ran like a champ. Anyway. I disconnected the computer, moved it to another spot in the room and started to blow away and remove the dust. The only hardware I removed was the Heatsinks fan, and the video card. I didn't disconnect any cables or other hardware. Once it was clean, I reconnected the fan and the video card. I started up the machine, and noticed that it took much longer than usual to boot to Windows Vista Ultimate. Once it made it to the login screen everything looked fine. Although after I typed in my password. The system logged in and all that I could see was the cursor. Nothing else, but the cursor (Mouse arrow). So I proceeded to restart and check settings, relogin. Nothing. My system wouldn't even boot into safe mode. It would lock up at a certain point. I've left 1GB of ram in the machine and decided whatever was on my OS drives was not valueable enough to cry over and proceeded to reinstall the OS. Sadly, the system would not accept my DVD of Windows Vista. Why, I have no idea. So I started to install Windows XP Pro SP2 onto my machine. This had issue after issue not being able to copy or locate installation files. I tested the ram and that turned out fine using Memtest. The Hard drives are in a healthy raid (Says NVRAID). The Windows Installation CD I'm using has the SATA/Raid drivers built into it (Thank you NLite)... So I'm left with issues... I cannot get another copy of Windows Vista because .connect.microsoft.com no longer provides downloads for Vista for the beta testers, so I'm somewhat stuck. Any suggestions?