Have Dell 8300 with XP Pro I run alot of very heavy programs like photoshop, adobe video editing and after effects programs. Have 2.6g P4 with 2 gigs ram. My machine is very slow recently - before it was responsive. Cleaned out all virus type stuff - not much found. Question: If I were to set my virtual memory size manually - what numbers should I use. Someone told me to use 1.5x times the ram size and another told me .5x. The Dell people told me 2048K. Is there a way I can make a good intelligent choice - what are the guidelines? Should I especally defrag the virtual memory area(if you can - seems like I did it with my PD defrag program by enabling a defrag at bootup. Thanks for any advice. I have 350 gigs of external hard disk space for video editing - and 50 gigs free of my 120 gig C: drive left.