Dell XPS T700R, Need help combining two hard drives into one spanned volume.

I have an old, but functioning Dell XPS T700R with upgraded Windows XP SP3 OS and a Maxtor 20 Gig hard drive.  The 'C' drive is 98% full with windows security patches and updates. I can't delete any more unneeded files from it.   I added another internal hard drive (Seagate 20 Gig) in the extra disk space provided for upgrades.  The extra hard drive 'F' is not linked to 'C'.  I want to link both drives together to create a spanned volume, but I'm not sure how to do it.  The 'C' drive is FAT32 file system.  From what I have read, I think I have to convert to NTFS filing system to combine disks.  I don't think I have enough space left on the "C" drive to do anything at all!  So how do I accomplish this?

Do I copy everything (take an image) from "C" to a usb 20 gig flash drive, delete all info on both disks and then go to diskmgmnt.msc to create the new spanned volume?

Do I then copy everything from the flash drive (including the OS) to the newly spanned volume "C" drive?

Is there a Method of Procedure on how to do all of the above?

Also, when connecting the extra internal hard drive, do I use the same ribbon that the primary IDE device is connected to, or do I add another ribbon to the IDE Controller (Promise Technology) card? I think I should probably use the same ribbon that is stamped IDE 2.

Thanks for any advice.