Exchange 2008 OWA on 2003 x64 Application Error

Hi guys, first of all thankyou for your time, i have tried to fix this and its driving me insane. New server with windows server 2003 x64 edition and Microsoft Exchange 2008. Exchange in the majority works fine except i CANNOT get OWA working. I uninstalled client access then uninstalled IIS and when i installed IIS i selected everything but NNTP and SMTP. I install client access again but as soon as i try to access OWA i get the error below:

Server Error in '/owa' Application.
--------------------------------------------------------------------------------

Runtime Error
Description: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed.

Details: To enable the details of this specific error message to be viewable on the local server machine, please create a <customErrors> tag within a "web.config" configuration file located in the root directory of the current web application. This <customErrors> tag should then have its "mode" attribute set to "RemoteOnly". To enable the details to be viewable on remote machines, please set "mode" to "Off".

I have gone into the web.config file located in the directory the OWA application is set to in IIS and whether i set that to On Off or RemoteOnly i cant get a usefull error message to work with.

I also tried running password resets on the IUSR accounts and then adjusting there passwords in IIS accordingly but still the same result.

Your help would be appreciated this really is cutting into our staffs productivity
richardlawesAsked:
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Girish_2500Commented:
Remove the web.config to a different location and create the recreate the OWA virtual directory.
Remove-OWAvirtualdirectory -identity cas server name\owa (default web site)
New-OwaVirtualdirectory -Identity Cas Name\OWA (default web site)
http://technet.microsoft.com/en-us/library/aa998589.aspx
http://technet.microsoft.com/en-us/library/bb124811.aspx

Or

Replace the web.config with another  CAS server .

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