Problems witn Startup Repair and WinRE

I'm posting this here because I'm hoping some MVP sees this and can provide
some help ...

My problem is that I'm not able to boot into WinRE using the Vista DVD or
the Windows Anytime Update DVD. This means that I can't run Startup Repair.

I read about installing WinRE to my hard drive, and since I was messing
around with triple booting XP/Vista/Ubuntu (another story for another time!)
, I was having to repeatedly use the Vista DVD to do Startup Repair, so I
thought it would be great to have Win RE on the hard drive instead.

So, I downloaded the WAIK and other stuff, built the necessary files on a
separate WinXP box, copied them over to my Vista box and installed WinRE.
That's where I ******* up. I was careless and installed Win RE to the Vista
OS partition. But I thought I was doing the right thing at the time. When I
rebooted and pressed F8, instead of getting the nice recovery menu screen, I
got the standard safe mode screen.

So, then, I booted into the DVD, but instead of getting the recovery screen,
I just got the Aurora background -- and there the machine sits, apparently
nothing happening. No menu. No mouse cursor. No disk activity light flashing.
Nothing.

Suspecting that maybe I had damaged the Vista DVD through repeated use, I
booted from the Windows Anytime Upgrade CD -- which is supposed to provide
the same WinRE environment. Same result -- Aurora background, nothing else.

In reading over the WinRE installation instructions again, I notice that it
said "full retail DVD" but I have an OEM DVD, Perhaps that was the problem.

Anyway ... I'd like to remove the WinRE I installed so that I can restore
the ability to do Startup Repair (and other things) from the Vista DVD.

Is there any way to do that -- remove WinRE?