Exch2k7 OWA IIS & RSA Auth Agent Service Unavailable

A couple days after installing RSA Auth Agent 5.3 for IIS w/o enabling or configuring it on my Exch2k7 64bit Win2k3 Stnd Server, all IIS sites including OWA and the default site produce 'Service Unavailable' and I received these events below and my IIS is reporting Service Unavailable for OWA and other related IIS virtual directories.

Event ID's:
Event Type:    Error
Event Source:    W3SVC-WP
Event Category:    None
Event ID:    2268
Date:        10/10/2008
Time:        8:16:12 AM
User:        N/A
Computer:    NYC-EXCH1
Description:
Could not load all ISAPI filters for site/service.  Therefore startup aborted.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 7e 00 00 00               ~...  

-------------------------------------------

Event Type:    Error
Event Source:    W3SVC-WP
Event Category:    None
Event ID:    2214
Date:        10/10/2008
Time:        8:16:12 AM
User:        N/A
Computer:    NYC-EXCH1
Description:
The HTTP Filter DLL C:\Program Files (x86)\RSA Security\RSAWebAgent\WebID\IISWebAgentIF.dll failed to load.  The data is the error.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 7e 00 00 00               ~...  

I tried installing .NET 3.5 SP1 on my Exch2k7 box and I still receive 'service unavailable'.  Previous step was reinstalling the Exch2k7 Client Access role, which didn't help.

ANY IDEAS?

I tried this potential solution and it didn't resolve my issue:
http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_23344735.html#discussion

LVL 1
lseemanAsked:
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lseemanConnect With a Mentor Author Commented:
I was able to resolve my specific issue by:

1. Right click on IIS Website folder and choose properties | Services | swtich to isolated mode
2. Under same properties | ISAPIFilters | Remove RSA Filter
3. Switch IIS back to non isolated mode/worker process isolation mode by check mark out

NOTE: This likely resulted from a 32bit RSA Auth Agent instead of 64bit version.
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