First, grab your Windows 7 install disk and run a repair on the disk - this should fix the bootloader, which will remove the OS menu when you boot the laptop and make it automatically boot windows.
To free up the space, you can then use either the windows 7 partition manager, your favorite partition manager, or the partition manager from your favorite Linux live CD to delete the Red hat partition ( write the the size of your windows partition so you don't accidentally delete it - it might also be labeled "ntfs" in the partition editor). The windows 7 partition manager has the bonus of labeling your partitions with drive letters to help prevent you from deleting the wrong one.
After you delete the Red Hat partition, resize any other partitions to take up the newly freed space if you don't already have plans for it.