|To remove both you need to delete all partitions on the drive and start afresh with a new, empty partition. |
if your PC has a floppy drive you can use a floppy boot disk to boot into DOS, get it here: http://www.bootdisk.com/
After booting from it, use FDISK to delete and create new partitions. Then use FORMAT to format the new partition. Instructions here: http://support.microsoft.com/kb/255867
If Windows still will not install properly, the hard drive may have failed.