Server crash, Illegal

[KumlaOnline]

Hey our server has recently gotten this error message ALOT

threadtools.cpp (2610) : Assertion Failed: Illegal termination of worker thread
'CNet Encrypt:0'
Assert( Assertion Failed: Illegal termination of worker thread 'CNet Encrypt:0'
):.\threadtools.cpp:2610

Or similar to that, we run a Counter-strike: source with Sourcemod

It's not a plugin we have already tried to determen the fault and its not a plugin.
so what is it?
Do anyone know whats the fault of the error to crash the server?

i have searched pretty much and i saw that MANY have this issue.
We run on a windows xp professional 32-bit version 2002, service pack 3.

[brian123]

ive never seen this. um re-install or run a update, try to run a update first