Ok, I've installed the new file - thankyou.
As for low memory, no memory intensive apps were running.
This is a client pc on a home network, the following apps were running,
IE6, The Bat (email), Sygate Pers FW Pro, CloneCD (tray icon), AnalogX Cookie Wall, Meaya Popup Ad Filter.
I has BSOD when I was using IE, it gradually slowed down & wouldn't display a page properly before BSOD.