I had the same thing happen to me once. I had Nero on the computer, and tried to remove everything associated with it, which included Imagedrive. When I tried to remove it, that mystery partition popped up. Is that the case with yours?
I had to reformat the HD because of it. It was the same size and was also called Dell Utility like yours. I know 32mb isn't much space on a 40 gig hard drive, but it was mainly the fact that it was there that pissed me off most.