Hi,
What OS did you have working previously?
Can you "dir" c: to check that it is allocating that letter to your HD and not another IDE device?
What boot disk are you using (Win98SE, WinXP etc)?
If you are trying to use Microsoft fdisk to remove a linux partition then you will have problems. You'll need something like IBM's ZAP or WIPE utilities.
Once we have a few more details we can give a better answer.
Please though, post this in OS or some other forum. It will be locked in this forum before long as it is not highly technical!
See you in another forum,
Andy