No C: drive ?

I got brave – thought I had done okay with 98. New network computer, thought I’d try XP Pro. It was (is) great. This is the first OS I have not had major trouble with.
Two problems though – one is not terrible – Scanner – XP does not want to play with Twain for scanner, I just put it on another network computer running 98.

The thing that is driving me crazy – My boot drive is E: – there is no C: drive. It (XP) will not allow me to change my main boot or system drive designation. This is more of an oddity than a problem. Everything works fine. I am inclined to leave it alone.

Thank you,
Bruce T