The patch only applies to the specific symptoms, DJ, which it does say. By 'system crash', do you mean your whole PC, or just Explorer? This relates to a problem when accessing folders, etc, on your hard drive. The screen freezes, then the desktop goes blank for a second or two, before (in XP) restarting, minus half your system tray icons (by the clock), but you are able to continue working. I installed the patch, and the problem is now fixed.
