SAV mail security corrupt Exchange 2007

We had an issue recently where the customer installed SAV mail security 5.0 on his exchange 2007 server, after installing it, OWA stopped working, user’s couldn’t login using outlook anywhere,  Answer was Symantec Mail Security 5.0 was using 32 bit, and the server was 64 bit.  By installing Symantec Mail Security it moved the OS to a 32 bit and changed all the permission right for IIS, .NET  and OWA.  Microsoft used a script to covert it back to 64 and recreated IIS, .NET and OWA.  All work and still working just fine.