To convert a partition to Windows, you need to delete it and recreate it with fdisk, then format it. Run 'fdisk' or 'cfdisk' as root, delete the Linu partition, and create a Windows one (it is type 0c for FAT32). To format in FAT32, use 'mkdosfs -F 32' on the partition. If this is the partition RH is on, it can't delete it because it needs it to run. If this is the case, you will need a Linux bootdisk to do the job, or use Windows.
In Windows : Control Panel >> Computer Management >> Disk Management. From there you can delete the Linux partitions and create Windows ones. Then you can format the partition.