I am sorry I am a week late
I am in the US but have the Australian release of 1946- I pre-ordered it so that's what I got
I had no issues on Vista (but would only install from the .exe on disk), but when I tried installing on Win7 64 bit (from the .exe of course), the disk spun and the installation seemed to begin, then the window disappeared, and then- nothing! Spin spin spin...nothing. After a few minutes of the DVD drive spinning noisily I removed the disk, and then had lunch. On my return, the PC had told me that it couldn't install 1946 because no disk was present
I was using no compatibility modes; in my experience with Vista and Win7 it has never netted results
I put the disk back in and clicked "OK". Spin spin spin, for five minutes or more. I let it go, and left the room. Ten minutes later I returned and the sim was installing
The first part of my experience sounds very similar to yours, silent-one, although we had different solutions. I too wondered if it was securom causing the problem