On the machine I'm using now, I have Windows2000 Server. I have two RAIDed 60GB hard drives (120GB! muwahaha! :) I always install on the same as the OS, and in the default directory. Saves the hell of any installation of add-ons. I personally keep backups of all my poser stuff both on this machine and also on another computer i have. ALWAYS save the zips, whether you have to resort to CDs or not. When you deal with Poser stuff, redundancy is the best policy. :) Tip for reinstalling. If you have it installed in your default /Metacreations/Poser 4/ directory, why bother deleting all the items youve added in? Just do a Add/Remove Software, and it will wipe all of the program itself, not anything else. When you re-install, good as new. Of course, you will have a few conflicts if something you added overwrites the default poser file (like a geometry), but in the overall scheme, its very effective and time-saving.