Exchange OWA not working

Ok, I was having a problem with some .net side by side errors so i uninstalled and reinstalled 2.0,3.0 and 3.5 .net framework. Now OWA will not show the login page. HTTPS://mail.provmedgroup.com/owa . Please help me.

My Suggestion : - 

You may need to rebuild the OWA , Run this command in the Exchange Management shell:
 Get-OwaVirtualDirectory |fl >Owavdir.txt
This provides an output file that can be used as a reference when you re-create the OWA virtual directories For Exchange Server 2007
Run EM Shell , Deletion of OWA Virtual dir:
    Remove-OwaVirtualDirectory

"exchange (default web site)"
    Remove-OwaVirtualDirectory "public (default web site)"
    Remove-OwaVirtualDirectory "exchweb (default web site)"
    Remove-OwaVirtualDirectory "owa (default web site)"
Recreation:
New-OwaVirtualDirectory "exchange" -OwaVersion Exchange2003or2000 -VirtualDirectoryType Mailboxes -WebSiteName "Default Web Site"
New-OwaVirtualDirectory "public" -OwaVersion Exchange2003or2000 -VirtualDirectoryType PublicFolders -WebSiteName "Default Web Site"
New-OwaVirtualDirectory "exchweb" -OwaVersion Exchange2003or2000 -VirtualDirectoryType Exchweb -WebSiteName "Default Web Site"
New-OwaVirtualDirectory -name "owa" -OwaVersion Exchange2007 -WebSiteName "Default Web Site" –InternalURL https://internalURL/owa -ExternalURL https://externalURL/owa

Incase you are different version of Microsoft Exchange then please see http://support.microsoft.com/kb/941201/en-us