Help!  Adobe Reader 9 won't open a PDF in a browser window!

I just "upgraded" to Adobe Reader 9 today, on my Windows XP computer.
I run Firefox 3.0.8 as my web browser.
Since installing AR 9, I cannot open PDFs inside my browser.  When I try, I get the following error message:
"The Adobe Acrobat/Reader that is running cannot be used to view PDFs in a Web Browser.  Please exit Acrobat/Reader and exit your Web Browser and try again."
I have made sure my Application settings in Firefox are correct, associating PDFs with AR9.
I made sure "Display PDF in browser" is checked in AR9.
I need to be able to open PDFs in my browser for work. How do I fix this error?
Thank you,
Ben

No Solution here either, but I'm experiencing similar problems. When opening pdf's my system just hangs and I'm having to reboot. This is not helping me with my business at all.
I suppose it's just part and parcel of upgrading these days. Good luck with trying to down grade. I've just tried and there's more frustration than success. Oh well, I do have a 4 day weekend to get it going again.
Best of luck to you,
John
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