well if you use a windows 98 boot disk, or a bootable CD of some description then you can startup fdisk, this will show you all the partitions on the Hard drive just delete the partitions with Linux on them. They should show up as non-ms dos based partitions, but come to think about it so will the NTFS partitions on your windows machine. so choose carfully what partitions you want to delete!! the next step is while you are in MS-dos run fdisk /mbr that will wipe grub out and then you can go from there. although i'm not sure that what your saying will work.
if your really unsure of what partitions hold windows on it then just run the fdisk /mbr, that will get rid of grub and try your windows XP CD then.
Last edited by paul_mat; 06-10-2005 at 12:50 AM.