For those of you who are running IE8 with adobe reader 9 on windows vista........
If your pdf files donot open .go to adobe.com down load adobe reader 9.1....!!!! This has an add on that works on the IE8 bar. make sure all your windows are closed except the one your on ......if during down load it says to close a certian adobe getplus program click ignore. You may have to do this twice during the installation.....you must ignore the getplus waring because it's the program thats loading your 9.1 reader.
when done restart your PC and wah la.........pdf files are now reconised by IE8 and will open.