Warlords CD can't be identified by OS (Update)

[monkeyboobs]

Hi there

I've got a curious problem:

I can install Civ4 and Civ4 BtS normally, but when I put the Civ4 Warlords CD in my DVD drive, Windows can't identify any disc

I don't use CloneDVD, DAEMON Tools or anything else comparable, so I wonder what's the reason for...

As long as I used WinXP no problem occured, it's only since I use Win7 Ultimate.

Any idea?

Thanks a lot

Edit:

Argh, same conflict with Civ4 Col