I had the problem where it would not install. I figured that for me it was a WINDOWS registry thing (No you dont need to tinker with the registry-dont panic). In MY CASE, I have both Poser 5 and 6 installed on my machine and had resinstalled POSER 5 (for use with Tailor 1.5). No problems with popping in the Poser 6 CD and reinstalling. No changes (except the registry sees Poser 6 now and not 5). Ran the SR2 update. Dots and preferences are OK. Shader Spider is still functional. No problems reinstalling.

"Few are agreeable in conversation, because each thinks more of what he intends to say than that of what others are saying, and listens no more when he himself has a chance to speak." - Francois de la Rochefoucauld

Intel Core i7 920, 24GB RAM, GeForce GTX 1050 4GB video, 6TB HDD space
Poser 12: Inches (Poser(PC) user since 1 and the floppies/manual to prove it!)