You can use a normal MS install DVD and use the OEM method of activation, provided the activation is based on the SLP information in the bios. While not complicated, it is a little more work than a post in a forum. Take a look at [url]http://reboot.pro/16578/[/url] for information on how to do this. If you have the original rescue image (DVD or on the hard disk), you can extract the Digital OEM Certificate from the OEM directory (usually in Windows/system32/OEM) of that image.
As another poster points out, this is unlikely to work in a VM due to the bios being part of the activation process. With lots of research, you may be able to work around it.