The memory could not be read

Hi guys,

My first post here, not sure if its the right place for this question but here goes anyway.
I'm running a Halflife 2 deathmatch server, which has been working great for a while now, but recently when i have added new maps to the server map cycle when it changes to the new maps it crashes the SRCDS.EXE program, and i get this message The instruction at "0x00db2c4a" referenced memory at "0x13d00b4" The memory could not be read.
I've reinstalled windows which made no difference, then i reinstalled the SRCDS program which seemed to work ok for a few days but now i have the same problem again.:confused

My pc is AMD 64 3700, Windows XP home edition s pack 2, 2gb ram, X1950 G card.

Any advice would be greatly appreciated.

Cheers,
Rog.