I run Poser 8 on Win 7 with no issues, but most install exe's need to be run in compatibility mode to install correctly.

In compatibility mode Win 7 may tell you that the program did not install correctly and give you the option to reinstall using the recommended settings. Choose that option and it should reinstall correctly for you.

It's a rightious pain in the rear, but I have learned to put up with it and have accepted that almost all "old" installers will need to be run twice.

The most common problem I encounter is incomplete installations - missing geometries, buggered texture files etc.