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Try opening these with AdobeAcroba Reader. Are you getting any error messages when this happens. From your other post, it may be that the problem is being caused by incorrect file associations.
Whereof one cannot speak, thereof one should be silent.
You need to have Adobe Reader installed to open PDF files. Do you have it installed? If not, follow this link http://get.adobe.com/uk/reader/ If you have it but you are unable to open a file, you may need to reassociate the file type with the program. The easiest way to do this is to right click on a PDF file and select "Open With" and then select or browse to Adobe Reader. Make sure you put a tick in the box that says "Always use the selected program to open this kind of file".