Instead of committing your whole D: drive, consider installing using WUBI.
http://wubi-installer.org/
I am running in WUBI-installed Ubuntu right now. It's my first go at it, and WUBI is an incredible starter drug for Ubuntu, since it requires no commitment and can be removed from the machine by uninstalling from Windows. It's a much better option than trying in VMWare, because you don't have to use hardware emulation (so my 3-D card works the way it should).
Basically, WUBI is a dual boot option that runs Ubuntu in a virtual disk stored on one of your hard drives as a file. But it isn't virtualized any other way, so you get pretty much all the benefits and drawbacks of a full Ubuntu install, but with an option to uninstall the whole thing and start over.
On the other hand, I have been using Ubuntu for two days and have moved my entire family off of Vista Home and onto Ubuntu accounts. If everything works well for the next month or so, Vista may be coming off my machine entirely.
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