I'd recommend at least 512MB of system memory for Poser, and a full gigabyte is better. Some motherboards won't support that much memory. Which version of Windows do you have? XP seems to handle memory better than earlier versions. The video card will have little if any impact on performance; Poser, at this time, doesn't use 3D hardware acceleration. Upgrading the card might help with other applications, however. Your best bet is to upgrade the memory first, if possible, and then consider a faster processor and motherboard.