Cavey
eidolon
what it's looking for is autorun.exe but maybe that isn't there, most discs have autorun.ini. If this is the case, which I have no idea cause I've never had that problem... open the ini file and read what .exe file it says on the inside. Then just run that file manually. Most likely that would be just something like Setup.exe or Install.exe. (it wouldn't hurt to just look for those from the start.) (if you don't see it just inside the disc directory, look inside the folders in the disc. It shouldn't be too hard to figure out which one it would be in.)
I have no idea if that will help you or not, it's just my 2 cents. ( it's what I would prolly do if that ever happened to me )
This is the easiest way. Just put the DVD in your drive, and right click the drive and choose open. You can now browse the contents of the disk. Find install.exe, setup.exe or whatever the autorun is actually targeting.
Saves you having to play around with registry, which if you get wrong, could ruin you entire OS install.
+1