Quote - I started Poser 7 today and while launching, I got an error message stating that the program could not load because python22.dll is missing.

This suggests that you copied your P6 Runtime into the P7 directory.
The only way to fix this is to reinstall P7.
Before doing so rename your current P7 directory so that you can use the same name when reinstalling.
When you have reinstalled, just add the Runtime from the renamed directory as an external Runtime so that you can still access your previous content.