Using the search function for VPC 2007 SP1 digs up a lot of people's favorites, while Googling turns up a lot of sales-pitches (for Vista) and a very thin FAQ. Using VPC with Returnil is even harder to research. Trying to find answers to simple questions is tougher when everyone else seems to be light-years ahead in this technology, compared to me that is. The step-by-step installation is simple enough, but the configuring is what I want to find out about. For starters; I have 1G of ram using XP-Pro/SP3. The specs say 128MB of ram for host/guest OS. So how would one divide 1024MB Maybe 512 each or 768/256 favoring the host Another thing is that using Vista, you can use the same license for each host/guest, but what about XP Do I need a separate Product-key for each guest-OS Can one create the Virtual with Returnil protection "ON" and re-install each time when needed, or does it need to be saved to disk for quicker restore These may seem like simple questions for you pros, but by the sampling of questions that I have, you can just tell the margin of success (error) that I may enjoy if I jump in unprepared like I would with a scanner or firewall. Any advice for a noob before he takes the plunge Anyone using Virtual PC 2007 SP1, and possibly Returnil too, that is willing to share some advice Even links to info would be of great value.