[Judas]

turn that sleep shit off will fix that problem unless you really feel like you need it.

for xp: control panel / power options /system standby.

if you need to sleep, doing a google for "sleep mode" +"doesnt come back". something along those lines. ive seen people posting about this problem a bunch of times. I dont use the sleep mode thing so ive never had it happen.

google "low on virtual memory" +"windows xp"