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InDesign has never been able to open PDF files. You should be able to Place them in InDesign, or open them with Acrobat (or Acrobat Reader).
I don't know why you would get that error when trying to Export as PDF, though.
Thank SJRiegel. So here's the thing. If I double click open the pdf file from my desktop. It opens InDesign and then prompts me with that box. If I "Open with...Adobe Reader" the file opens just fine.
Thank you thank you thank you!!
BTW, since this is an InDesign forum... If you ever will have more than one ID version installed, and try to repeat this 'trick' with indd files, it won't work.
The last installed version grabs all indd files, doesn't matter with what version they were created. You won't be able to 'fix' it without reinstalling ID in 'proper' order.