Problem using/upgrading camera raw

I have Windows 7/64 bit. When I first installed Photoshop CS5, I immediately upgraded Camera Raw. Later, after opening Bridge from Photoshop, I found I could not get Bridge to open a file in Camera Raw. I knew that Raw was working because I had previously opened an Adobe lesson file using it. When I attempted to open one of my files I received an error message: "Bridge's parent application is not active". I have since learned that Bridge will only open a file in Raw, if Bridge is initiated from the 32bit version of Photoshop (or if the 32bit version of Photoshop is open). OK, I thought I'd solved the problem, ie open both the 32bit and 64bit versions of photoshop and then access to Raw is fine. However, I then decided to upgrade Camera Raw in the 32bit version of Photoshop. When I then attempted to open what I thought was the 32bit version, I got the 64bit version instead and, of course, lost the access to Raw.

I've only learned this after uninstalling and re-installing several times. I'm now not willing to upgrade Camera Raw for fear of losing access to it again. This is not a very satisfactory situation.

Does anyone understand what is going on, and whether there is a work-around?

Thanks

Grahame M