Disk is not formatted
Windows cannot read from this disk. The disk might be corrupted, or it could be using a format that is not compatible with Windows
The DVD says it's "zone free", right click E>properties>Hardware tab>Liteon DVD-ROM drive (i'm positive this is the hardware)>Properties>DVD Region is set to 2, which is the zone of where this DVD comes from (Japan, even though I'm in Europe, they're the same zone).
I've noticed a difference between that HW and the cd-rw HW though: under "device properties", by "location", it says "Location 0 (0)", whereas for my cd-rw and zip drive they say "Location 1 (1)". I did in the past install DAEMON tools and have a virtual dvd drive, but I turned it off. Anyways, I'm guessing E: somehow got the DVD drive stuff unassigned to it. The Windows troubleshooter didn't help me at all. I'm also sure the DVD is fine since I can play it on my laptop without a problem.