OK, I completely uninstalled IIS and Re-Installed using these instructions from Microsoft.
http://support.microsoft.com/kb/325889/
Ran "aspnet_regiis.exe -i" which completed normally. I had previously installed the MS ASPNET Framework Setup Verification Utility which says ASP.Net 2.0 SP2, 3.0 SP2, and 3.1 SP1 are good to go.
FYI - I had previously unistalled and reinstalled all versions of ASP.NET on this server thinking it would fix the problem since the only error I was getting was from ASP.NET.
Rechecked and reapplied file permissions for the NETWORK SERVICE account to the site files and ASP.NET Temporary Files.
Still no joy. On module or file upload the process still hangs with no errors other than the same one I reported in the original post which I've reposted below. And, as usual, the IIS services can be stopped but will not restart and the server must be rebooted.
Ken - I also tried in Medium Trust with the same result.
Event Type: Warning
Event Source: ASP.NET 2.0.50727.0
Event Category: Web Event
Event ID: 1309
Date: 7/13/2010
Time: 8:10:46 AM
User: N/A
Computer: xxx
Description:
Event code: 3001
Event message: The request has been aborted.
Event time: 7/13/2010 8:10:46 AM
Event time (UTC): 7/13/2010 12:10:46 PM
Event ID: bd90cf2df42b4b2da7e11fb57b1c0acb
Event sequence: 64
Event occurrence: 1
Event detail code: 0
Application information:
Application domain: /LM/W3SVC/117891778/Root-1-129234963840906198
Trust level: Full
Application Virtual Path: /
Application Path: C:\Inetpub\SDINC\
Machine name: xxx
Process information:
Process ID: 812
Process name: w3wp.exe
Account name: NT AUTHORITY\NETWORK SERVICE
Exception information:
Exception type: HttpException
Exception message: Request timed out.
Request information:
Request URL: http://xxx.xxx.com/Default.aspx?TabId=18&ctl=Install&rtab=18&portalid=0
Request path: /Default.aspx
User host address: xx.xxx.xxx.xx
User: host
Is authenticated: True
Authentication Type: Forms
Thread account name: NT AUTHORITY\NETWORK SERVICE
Thread information:
Thread ID: 8
Thread account name: NT AUTHORITY\NETWORK SERVICE
Is impersonating: False
Stack trace:
I'm at my wits end with this one.