Have you updated your Office?
so you were manually updating Adobe by downloading the full file?
Is this a point we need to look in to why you did it manually?
Adobe offers updates automatically<< was this disabled?<< could be virus?
Did you attempt to update from printer?
There is also the start menue all programs Adobe and check for updates?
Do you see Acrobat and or Adobe x at the top of the start menue all programs?
You have looked in add remove programs for Adobe and> Adobe Air?
If helps nothing, try it: PDF Repair Toolbox is a a new Adobe Acrobat file repair tool that allows users to fix PDF files which are inaccessible from Adobe’s file recovery. A common error message from Adobie is that Acrobat PDF file format is having difficulties, the file is damaged and could not be repaired by normal means.