Might I suggest also backing up your finished Runtimes as well as just making sure your installers are all backed up?  As time passes one adds more and more content to their Runtimes, and organization becomes a MUST.

Comes in handy for me to have my entire, organized, Runtime backed up on an external disc so that I can reload content directly from that archive or use it to install content on second or replacement computers.

Poser 7 should work well under Windows 7.  Good luck and happy holidays yourself.

Rªnce