My virtual memory is set to half my RAM, i.e 512Mb. This is a fixed size file which rarely gets used, Adding "Conservative swapfile usage=1" to the win.ini file stops windows using the swapfile until ALL RAM has been used, because as we know windows memory management sucks.
I of course defrag my RAID array every couple of days, or when I've installed/deleted a big prog.
I guess it's just one of them weird computer mysteries!?