I had a lot of problems rendering in P4 (slooow and often crashing), and I had way moore with P5. I have a Gigabyte Pentium 4 TS GA-8IRX, and upgraded it from 128 to 256 of RAM. Now I read on a lot of posts that the problem could be the OS: Win98 doesn't allow to use more of 128 RAM or so... Could You tell me what kind of OS (Win 2000, XP, ecc...)would be better? And, then, would it be useful to expand RAM to 512 or more? Thanks a lot to everyone.