If you don't have a Windows install disk, STOP. If you delete the Linux partition, your system will not be bootable.
Originally Posted by irideablackbike2
what is gparted?
GParted is only one of many ways to do this---it is a Linux partition editor which comes with many distros and on a bootable CD---very handy to have.
I "think" that the Windows partition manager will delete any partition. Also, if you have a "Live CD" version of Linux, you can do it from there. Look in the menus for GParted, or maybe QTParted. If there is nothing, then open a terminal and use fdisk.
You will also need to boot from the Windows install CD--enter rescue mode. When you get to a prompt, enter fixmbr, and then reboot.