Boot SAFE MODE and try last known good configuration.
A little more advanced but you can do it. Look up NTPASSWD. This bootable CD can do an offline registry edit so you can put your registry back.
Good luck, Bob
ok first off i have 2 hard drives on my pc. my hp recovery which is C drive where xp is installed and the main hard drive i use which is D.
i wanted to change the name of my C drive to something else so i was playing around and went to this link here(see below). i went into Regedit.exe and into HKEY_LOCAL_MACHINE, SYSTEM, and then MountedDevices and changed the name of C drive into M drive and i changed my D drive into C. i restarted and now windows wont load properly. i cant get to my desktop, im stuck at the blue windows xp load screen just before you get to the desktop.
how can i change the letters of the drives back to the way they were before without being able to access my desktop. i obviously screwed up windows since it doesnt recognze itself on the new drive, so i need to change it back.