Just like to repeat some useful advice that I picked up elsewhere......
My laptop was at its limits operating FS2004 and all the add-ons that I have added in/on, but I found that disabling the anti-virus programs helped to stop crashes (they can use a surprising %age of processor power even though they are in the background), so if your computer is near its capacity, then try turning anti-virus programs off.
Deframentation also helps, so if you have not done it for a while then clean up your drives.
Soon time to buy a new computer though.......
Give it a try just dont end any processors you suldn't! 