Ok, so ever since I started using multiple hard drives for multiple OS's, I've had issues with drive letters and boot settings. I've come to understand that Vista, when installed, decides that regardless of whether you have multiple drives or multiple OS's, will selfishly make itself the C drive no matter what. This became a problem for me when I installed it, having XP pro on my second drive (which was already the C drive). After vista was installed, my drive letters got f*cked up and I eventually uninstalled XP. More recently, I installed Windows 7 RC1 on that same secondary drive, but it recognized that vista was C, and made itself the D drive. However, upon a reinstall of Vista that I had to do a few weeks ago, my boot settings got screwed up and the boot files got allocated onto the W7 drive rather than the main system drive. I dont know if this makes any sense; its confusing, I know, but the bottom line is that dual booting always caused problems when I had to install/uninstall an OS. Here's my situation - I have 3 drives. One 150gig main system drive that has Vista on it. Second 250gig drive that has an unused W7 RC1 install. Third drive is 1TB and has nothing but storage. Drive one is C, drive 2 is D, drive 3 is Z. Right now everything works as it should. Here's what I want to do: 1. Uninstall Vista from the main system drive. 2. Uninstall W7 from the secondary drive. 3. Reinstall W7 RTM on first drive as C, make it my main system. 4. Reinstall Vista on secondary drive as D, make it a backup in case something screws up with W7 (OR I might not install anything on this drive at all. With vmware, it's becoming less and less necessary to have a dual boot system) 5. Keep storage drive untouched. What is the best way to achieve this and get all the drive letters properly assigned? I'm thinking it's definitely a must to unplug all drives except the one I'm installing on, but my fear is that once W7 is on the main drive, and I decide to get Vista back on the second drive, it's going to steal the drive letter and f**k up the W7 install. Any thoughts/suggestions are appreciated. thanks!