Finally someone who has the same problems as ME!! (and posted on the same night!!)
I have memory read errors in games too, and some games eg SOF II crash to the desktop with no errors.
Unfortunatly no software updates I've ever installed (Windows SPs/Fixes, Drivers or Games Patches) have ever solved the problem, and the errors only seem to occur with the Windows 2000 family of OSes and nearly always with games (Lavasoft's Ad-Watch 2.5 is the only app I think of which has similar probs).
The odd thing is the system and OS are both rock solid aside these odd errors.
Couple of examples:
Application popup: Lemmings: [Paul] Watch out, there`s traps about : LEMMINGS.EXE - Application Error : The instruction at "0x002e2099" referenced memory at "0x05be2470". The memory could not be "read".
Application popup: Ad-watch.exe - Application Error : The exception unknown software exception (0x0eedfade) occurred in the application at location 0x77e989d1.
I think the problems are likley to be RAM related (I have an AMD/VIA based PC with mixed RAM modules

). so I'll get a mem checker from one o the posted linked and post back with the results.