Trying to reinstall CS5.5 Master Collection from DVD media on Windows 7 64 bit - setup.exe fails due to msxml3.dll error PDApp message [FATAL] PIM - Failed to Create XML instance : DOMDocument40 ADXML::initWithXMLPath Error:80040154

If anyone is able to solve this they are a genius (or I am doing something very stupid!)

I am trying to reinstall CS5.5 Master Collection from DVD media on Windows 7 64 bit PC but setup.exe fails due to a msxml3.dll error.

Following a big bundle of recent Windows 7 updates, I started getting 'bad image' msxml3.dll error messages when opening any CS5.5 master collection program (Eg Premiere / Photoshop / Illustrator / Dreamweaver). Following advice on some threads here I tried uninstalling and then using the Adobe CC Cleaner Tool to clean up install, then reinstalling from my original DVD media.

Whenever I try using run setup.exe from installtion disc 1 the installing fails due to 'Missing files'. I have also tried dowloading trial versions and runing setup.exe fro mthe downloaded files but i still get the same message.

I have searched the forum and others have experienced this error but none of the solutions I have found seem to be working for me - as many seem to relate to download installations whereas I am installing from original DVD media (which worked fine before on the same PC)

These are the FATAL messages from the PDApp log

12/11/2014 15:29:27 [FATAL] PIM - Failed to Create XML instance : DOMDocument40 ADXML::initWithXMLPath Error:80040154

12/11/2014 15:29:27 [FATAL] Setup - Could not initialize ADXML object

12/11/2014 15:29:27 [FATAL] Setup - Unable to initialize. Error parsing setup.xml file

The PDApp troubleshooting seems to indicate that this is caused by error in downloads but I am getting it with both original media DVD and downloads.

I have also tried using my logon (which has admin privileges) and under our main admin account - and I get the same errors.

Is a clean install of Windows 7 + CS5.5 my only option?

Any help / info / advice / solutions very much appreciated! I have spent the last 2 days trying to sort this out and seem to be getting nowhere.

Thanks.