uninstall freebsd

[Ton Keesmaat]

Question:

I got a PC where freeBSD is installed. I want to uninstall freeBSD and
format my the harddrive so i can install Windows.
When starting the PC it asks for a login name and password which i don't
know. Booting with a floppy with MS Windows 98 works...finally i am at the
A: drive but i cannot go to the c: drive because he does not recognise this.
Can i get some info for how to to this? Or is there an internetpage with
info about this problem
sincerily,

Ton Keesmaat
keesmaat at tiscali.nl
06-21216078