Just installed Acrobat, now Firefox won't open PDFs

Hi,
I just installed Adobe Acrobat 8 Standard on my computer (running Windows 7). Now, if I click a link to a PDF in Firefox, it doesn't open. A new tab opens, as before, but then I get an error message telling me to close my pdf reader and my browser. I've tried this, it doesn't work. I've tried restarting my computer, it doesn't work. I've tried going into Task Manager and killing any task related to Mozilla or Firefox, then reopening Firefox and trying again, no luck. I'm getting to my wit's end.
What does work:
I can still save pdf files and open them with reader
I can still open pdfs using Internet Explorer
At some point during the process, it asked me if I wanted Acrobat 8 or Acrobat Reader 9 to open PDFs by default. I don't know how to reaccess this option to see if changing it would help. I'll gladly provide any more information neccessary.
Thanks,
Jackson C.

Just to add the specifics of the error message:
Title: "Acrobat plug-in."
Text:
"The Adobe Acrobat/Reader that is running can not be used to view PDF files in a Web Browser.
Please exit Adobe Acrobat/Reader and exit your Web Browser and try again."

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