Don't know how I accomplished this but was wondering if it can be resolved without going through another Windows Install. My GATEWAY Desktop Model E2500 running W.XP pro with Celeron Processor 2.8Ghz, 1 GB of RAM is booting from partition D and not C.  It's so mixed up. That is the partition that should have the backup OS on it.
It's running low on disk space and I can't even get SP3 installed. How do I boot and run from C instead of D?

thanks for any help you can give me.

LAMPost a screenshot of Disk Management...

How did this happen ? ?I had to reload Windows once so I must have picked a partition without noticing.

sorry, I can't figure out how to post an image. it's not on this pc
To describe the disk management: the D drive (3.52GB) is the boot drive and the C (73.16GB) is the system driveI'd suggest starting from scratch. Format everything and reinstall to c: drive. OK, thanks. Just thought I would check and see if there was an easier, shorter way. Haven't had much EXPERIENCE in this area. Thank so much for your time.

LAMUnfortunately there's no way to change the designation of the system drive without reinstalling the OS. Make sure there are no external drives / devices connected when you do the installation.gotcha, thanks!