I placed a 70MB ZIP file on the server and linked it in Documents.  When clicking the "Download" link I get the message "Server Application Unavailable".

I checked the Application Event logs and saw a message saying "aspnet_wp.exe {PID: 99} stopped unexpectedly"

I found a Microsoft KB doc that talks about breaking large downloads into chunks when moving to the output stream.  They give some code example:

http://support.microsoft.com/default.aspx?scid=kb;en-us;812406

Thanks,

-Robert B.

I got if fixed but the form does not allow me to post the solution... I do not know why.

I had the same Problem in 3XX and 4XX...

I have XP and SP 2 with all the latest updates + 1.1 and 2 Frameworks
I found this script on the net and even though it says it is for framework 1 only I did it anyway:

 I had to rem one line that checked if you have anything else than 1.1.4322 Installed as I wanted it to run anyway
The line is: if exist %SystemRoot%\microsoft.net\framework\v1.1.4322\mscorlib.dll goto v11_installed
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Look at http://www.asp.net/faq/ms03-32-issue.aspx

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After this script I ran "aspnet_regiis -i" On the Framework 2 Command promt (this is to RE install the Framework) and restarted IIS with "iisreset"

I then Re checked the Security settings (Permitions for ASPNET User) on the directories and All was OK

Hope this help!!!