I am using an old ACER laptop that uses Windows VISTA. I uninstalled the Adobe Reader that came with installation because it was a very old version and a security risk. The official Adobe reader site has not got VISTA on it's drop down menu for the various versions. This seems very strange to me. I tried their Windows 7 version of adobe and the Windows XP SP3 and neither of these will install. I have also tried installing most of the alternative free PDF readers and most of them won't install, including Nitroreader, Foxitreader, PDFlite, PDF X-change viewer etc. When I say "won't install" - I double click on the downloaded file and nothing happens. Right clicking and running as Administrator also does nothing. I have only gotten a few low quality PDF viewers to install. Is this a universal problem with VISTA, or am I alone in this predicament?