Solved! Now Have Just Windows Vista Ultimate
Looked all over the net for an answer but could find none. Plenty of tutorials on how to set up a dual boot but very few on how to delete a dual boot system. I installed Windows Vista Ultimate in a dual boot with Windows XP on the 31st of January (2007) thinking I would continue the dual boot until such a time as several issues with Vista were resolved. I found that most of the problems I had were resolved by Windows Updates or device driver updates. The only issue I had was with a Sony PDA which will not work under Vista. That was not Vista's fault but rather it was Sonys as it will not write device drivers for Vista.
A month ago I decided to begin the process of doing away with the XP side of my dual boot. No information became available and I had almost given up when I located Vista Boot Pro 3.3. After reading and deciding to take a leap of faith (done it before when I installed XP's Service Pack II), I went to disk management and right clicked my Vista drive (separate drive for both XP and Vista as well as an additional drive for data storage on D & E (partioned)) and right clicked and made the Vista drive active.
After that and using Vista Boot Pro 3.3, I checked the install the bootloader for Vista on my Vista drive. I restarted, entered BIOS, set the bootorder to start with the CD drive, and then shut down the computer. I unhooked the XP drive, safely exited saving changes from BIOS and restarted.
With the Vista DVD in the drive, when the computer restarted it asked if I wanted to continue with DVD in drive. I selected by hitting a key and it took me into Windows Vista installation. After selecting language, came to a screen asking if I wanted to install Vista or repair. I chose repair. A screen came up giving a choice of options. I chose repair startup. After I hit O.K., the computer ran a quick repair and restarted. That time I just let the system to continue to load even though the Vista DVD was still in the drive and I found the dual boot was gone.
After starting, I shut down again. Went into Vista and sent the hard drive that was to be the first booted hard drive to the Vista drive (which was already done) and noticed the old XP drive was moved automatically down the list)
Changed the boot order to first boot from the hard drive, made sure the DVD was removed and restarted. No more dual boot.
I then went into My Computer. I went to the drive that had Windows XP installed on it (C) and right clicked and selected reformat. It did and now I have a 120 gigs extra for storage.
The only problem I have had which really isn't a problem is that my system drive which is Vista has the drive letter V (originally when I installed it) and find now that it is the system drive I can't change the drive letter which is no big problem.
I hope this helps someone who has been looking and doesn't know how to proceed.