How do I stop ISA 2004 stopping sporadically

Every few days our Firewall crashes with the following error message (Event ID 14057 "... application filter module C://windows\system32\ntdll.dll generated an exception code c0000005 in address 7c81bd02 when function CompleteAsyncAccept was called"  It suggests the error can be resolved by removing recently installed application filters.  However the problem started on 3rd January this year and nothing had been installed on the computer since about 11th December.  It also throws up Event ID 1000 error message "Faulting application wspsrv.exe, faulting module ntdll.dll, fault address 0x0001bd02. It's really annoying because we loose all remote access to the server as well as loosing contact with Exchange and all emails.  Can someone tell me please how to fix this?  Thanks
MartyJWAsked:
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MartyJWAuthor Commented:
It now appears that the problem may be caused by a conflict between ISA and a module in the Anti Virus program running on the server.  It appears the two are trying to do the same job (interrogate streaming data coming into the system).  As a result, at the Anti Virus manufacturers suggestion, I have removed the particular module as they say it is not required at this level.  All appears OK at this stage (after a reboot) so we'll see how things go over the next few days.  Here's hoping.
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suppsawsCommented:
already updated isa to the latest servicepack?
did all your windows updates?.
after that, rerun the 'connect to the internet wizard'.
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MartyJWAuthor Commented:
Hi,  Thanks for those ideas. ISA is running SP3 and MS Update says no new updates are available for it.  This morning it crashed again but said the faulting module was imon.dll which seems to relate to our anti virus (NOD32) so my next plan is to check with them.  ISA restarts again with no problems but I just can't figure out why it keeps crashing.  Thanks again
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phantom024Commented:
Just wondering, what Antivirus product was it?
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MartyJWAuthor Commented:
The Anti Virus product is NOD32 by ESET.  A great product but seems to have this wee issue.  However we have now had no crashes for 48 hours since unloading the internet monitoring module so that is looking really hopeful.
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