Some people have suggest over on Dell Forums that 64-bit Windows 7 might be having trouble installing on a 64-bit virtual machine because the host OS, Ubuntu, isn't a Microsoft OS. Hmm ... could be the reason. So I'm now downloading the 32-bit version.
Since it's a virtual machine, performance isn't really something I'll be looking at. Although I will be watching the boot time. A fresh installation of Windows XP boots in a decent-ish amount of time. A couple of minutes. Ubuntu boots in less than 30 seconds.
What I'll be most interested in is seeing things for my self that many people have said are carbon copies of features from other OSs. So I'll be looking very closely at the taskbar. I don't have a touch screen so touch isn't even a consideration.
As you might expect I don't have much in the way of Windows software laying around. I've been a full time Ubuntu user for a while now. I'm sure I'll find something though.