FOR -as you can see I have 'restored' the letter 'C' to the correct drive. As you say, the machine WILL operate correctly without but there are still some less-than-perfect install routine that 'automatically' install to the 'C ' drive and you may find difficulties with these. I can remember installing some assembler-type stuff a while back that just stuffed things onto the 'C' drive (without any choice) and in those days the 'C' drive was the 'C' drive
. In your case, I guess best left alone, but the facility to change is there if you need it. The only drive letter you cannot 're-assign' in XP normally is the system/boot drive.