I have read most of your other posts on other topics and I am getting the idea that you must do things on impulse.
The jump to Linux was a good one. Perhaps Red Hat was a bad start, as RPMs seem to cause problems soon out of the gates. Perhaps you can give it another go sometime with a boxed set with a manual in it.
Here is what you do to get your windows back. I am gonna answer for both types of fixes, since I don't know what version of Windows you have. If you do as I tell you to, it will probably bring your Windows back:
1: If its Windows 95,98,98SE,ME do this ---
Get someone who is nice with windows 98, 98SE, or ME to make you a recovery floppy. That can be done in the control panel under add/remove programs, I believe. Once that is made, you have all you need.
Boot your computer with the floppy in the drive (be sure that your boot sequence in your BIOS is set to boot from floppy before the hard drive). Let it boot to the A: prompt. When done, type "fdisk /mbr". Remember the space before the "/" switch. Then remove the floppy and reboot your machine. You should be back to Win98 or whatever.
2: If you have Windows 2000 or XP, you'll be best served by borrowing a friend's installation cd and booting from it (choose 'boot from cd' when prompted). The same rule applied to BIOS settings: set it to boot from the CD before the HD. Let it churn along and get itself to the 'choose what to do' screen (about 5 minutes on my P-III 700). You'll at that point have the option to install Windows, upgrade Windows, or enter the recovery console. Choose the recovery console. Let it boot into it. You'll be presented with an A: prompt. Type "fixmbr". Reboot. You should be back in Windows. If that doesn't work, you've got more than bootloader problems.
The above steps are well documented on the web. A quick google search with even general search terms will give you results enough to keep you reading for days. I am sure there are other threads on this site as well that describe the procedure (regardless of whether its not a Linux-related question). Good luck
BTW: If you get back into WIndows, write down your product ID# and keep it in a safe place. Then, you might consider checking out prices on the cd for your OS. Ebay has a lot of sales on Windows disks constantly. You'd be well served to have one in case you ever hose your system. Sorry to see you give up on Linux. Perhaps after reading the manual for your distro of choice, you'll have a better handle on what to do if something goes wrong. Listen to the Boy Scouts and "be prepared"