Thanks for all the fantastic support in this forum! One of the most useful forums I've been on out here. Unfortunately I am one on the lucky owners of a Window Vista machine which has a corrupted registry and is not longer bootable at all, can't recover from the partition either (no recover point available). It tried to partly rebuild the Windows partition and then hung. After that... zippo, immediate crash, no safe mode, etc. However a hardware check function that still works says all HW is OK. HP a6400f desktop. So, I found all the info about the Vista Recovery/Repair disk. I downloaded the Vista_Recovery_Disc.iso file through uTorrent. I then burned this ISO image using ISO format. So supposedly I should have a bootable recovery disk. However, the HP Pavilion won't boot to the disk, even when the boot order is changed to make the DVD first. It just proceeds to a Windows crash screen. Is there any way to tell if the disk I burned is valid? Maybe it isn't bootable... Or is there some other issue? I found that I can buy the Repair disk for $30 from HP. Or get extended warranty for $100. What an incredible ripoff. Sad but expected. Progress report: Burned another Vista recovery disk and this time, it booted! However it cannot repair the problem. It finds a corrupted registry, then quits. How can this system be recovered? Would a new OS, say Windows 7, be able to be installed on this machine?