If for some reason another drive or partition has the boot loader, the XP system will not give itself the C: drive letter.
In this age of Windows 10, this is old stuff I know. But I really need my Dragon Naturally Speaking and I can not install it again. Nuance has a rather Draconian copyright protection plan, after a number of re-installs even on the same machine, it will refuse to work nice. I have one working install o f DNS on a backup XP drive.
I was hoping to use it on the same physical hard drive. But DNS thinks it must be on drive C: instead of drive F: and I can not remember what the procedure is t to fix that. Years ago there was something in the MS knowledge base.
I am not sure is the assign tool would work.