Cannot open old pdfs -- can anyone help?

Hi,
I have a CD with some PDFs that were created in 2004 and cannot get them to open. I get the dreaded "...is either not a supported file type or because the file has been damaged..." message, which seems to result from a number of causes, none of which are similar to my problem.
Anyway, until I got a Vista computer a couple of years ago, the files opened fine. Even though I couldn't open them on my Vista computer, I could still open them on my XP laptop. Now I cannot open them on the laptop either, even though I tried Adobe Reader 9 and 10, then replaced them with Adobe Reader 6 , which came on the disc with the PDF. I know the disc is not damaged because I can open all other file types.
Can anybody advise me? These pdfs are a auto manual and I cannot fix my car without them.
Thanks,
Neal Engledow

Try67,
Thanks for responding. I have tried dragging files onto my desktop but still cannot open them. I created a workspace on acrobat.com but get an error message when I try to upload one of those files (other pdfs upload fine) the error message says "svr.Unknown
[Unknown] Stream does not represent a PDF document." Can I attempt to e-mail one to you? I can e-mail them to myself, but they still don't open.
I also have tried three other pdf readers without luck.
Neal

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