The latest version of Acrobat (V.6 )can be downloaded from this link:
http://www.adobe.co.uk/products/acrobat/readstep2.htmlAdjust for download "mirror" sites(change country)going up a"Level" But difference in loading is small
File size is 15 MBs, but can load a "cutdown" version of 8 MBs with locked out features
Both are Free

. Go for the bigger size (about an hour to complete?) did it in 57 mins on my dialup though allow for over an hour?
Do Not save just "Open"it. Was getting lost in my files Filename is:
AdbeRdr60_enu_full.exe In case you lose it? LOL
after loading Install wizard runs and sorts everything automatically

Only job Left to do manually is to uninstall the old version via the "Add/Remove programs " program (Control panel)
What is Acrobat?
Basically it enables you to read and view documents like they are in print,can read E-books, catalogues such as
catalogs.google.com which have over 5000 catalogues!!(serious)in their collection to view. though they are not PDF files but they are very similar in appearance you can read
every page

More info here:
searchpdf.adobe.comand here:
www.adobe.com/products/acrobat/adobepdf.html