[Alug] How to remove an operating system

Can anyone advise on how to safely remove an operating system on a dual boot laptop? I have a laptop with a WIN XP partition and a Red Hat 7.2 partition, with GRUB as the boot manager. As I've now got a PC I can use as a dedicated Linux system I now need to put the laptop back to a single operating system Windoze XP. I have Partition Magic 7.0, but I'm concerned about just repartitioning/reformating the Linux partition. I don't want to end up with an unbootable laptop. Preferably I would end up with just one partition (Windows C:) and the laptop would boot straight into Windows without any boot manager program. Has anyone experience in this area got suggestions as to how to proceed safely? Thanks Karl Middleton