Had the exact same thing about 3 weeks ago, Mark
. Wanted to open a file in ACR and for the life of me, couldn't remember how to access it independently. Trawled all the way through Photoshop's menu tabs to no avail. After much profanity, head scratching and more profanity, I gave up and Googled it. I now have Bridge in my quick-launch icons
.
That's the comforting thing about computer and software problems, you can guarantee some other poor sod has had the exact same problem and posted somewhere about it. Solved my PC woes, many-a-time!