IIS Server Crashing every 2 days

We've been having this problem with our IIS 6.0 server for weeks now and we can not for the life of us figure out what the problem is.

The server will just randomly crash.. we don't see anything leading up to it in the logs...

At first, we thought one of our asp, DB applications which was using MSXML 3.0 & 4.0 was the cause (documented to cause crashes). But, we've changed all of the calls so that object isn't being used. Still, the crashing.

I wish I could post more specific information but honestly, I'm at a loss since IIS server management isn't really my area of expertise.

--moved to the IIS Forum, you'll get more help here.
1. what you mean "crash"? what exactly happens?
2. make sure Script Blocking is disabled for whatever antivirus you have installed.
3. check the memory usage on the server - see if something eat its memory.
4. try to see in the log files what file(s) are being executed before it crash.
5. check the server for worms and trojans.

More than likely you have some flakey asp code that isn't closing and destroying objects properly. Or your IIS is busy and you're using Access as a database for asp code, if so change to a more robust dbms like sql server.

As far as I can tell, I'm closing every object and session... and DB access is MSQL, not access.

Then you'll have to do some debugging, IIS doesn't crash just for the heck of it. Shadow posted some good tips for you to start with.