I have a windows service that I created in vb.net 2.0 and it initiates a
multi-threading application. When I start the service, it starts working but
at somepoint it writes a message to the event log (system) stating a
Application Popup error, I'm not sure why... but other times it works fine
and it keep working for like 4 hours and then it gives the same message in
the event log. The service doesn't crash or anything, it just "Halts" within
itself (not a pause) , I know that because I write to a log file from the
code of the service, and it stops writing to that file. I compiled the
service in Release mode.
Here is the error in the event log:

Event Type: Information
Event Source: Application Popup
Event Category: None
Event ID: 26
Date: 3/7/2006
Time: 9:36:51 AM
User: N/A
Computer: R17
Description:
Application popup: JIT Debugging : JIT Debugging failed with the following
error: 0x800405a6

Please check the documentation topic 'Just-in-time debugging errors' for
more information.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.