For many reasons (that were discussed here in 2007 including using 
XSLPatterns versus XPath), I have chosen to use MSXML 3.0 instead of 6.0 
when I am interacting with SQL Server Reporting Services SOAP (the Prog ID I 
use is MSXML2.DOMDocument.3.0 to parse and MSXML2.ServerXMLHTTP.6.0 to send 
the request)

Everything was fine up until I upgraded my SQL Server 2005 yesterday, and I 
inadvertently chose an option to install MSXML 6.0 during the upgrade. It 
seems that my 3.0 code doesn't work anymore and I get the error "Object 
required: 'xmldoc.documentElement'" where I use (Classic ASP) set xmldoc = 
Server.CreateObject("MSXML2.DOMDocument.3.0") .

I thought that my 3.0 would still be there along with 6.0. So, I downloaded 
and installed the Microsoft the XML Parser (MSXML) 3.0 Service Pack 7 (SP7) 
and it still doesn't work! The only related programs I have in Add/Remove 
Programs are MSXML 6 Service Pack 2 and SQLXML4. I found the MSXML.dll and 
registered it and that didn't work either.

So, what's going on and how I can I go back to MSXML 3.0?

Thanks for any help!