I have tried several times on several windows vista machines to install QGIS (both versions 2.10.1 and 2.8) but with no luck. It seems to install fine without any errors but when the installation is finished QGIS is nowhere to be found. There is no short cut created on the desktop and it does not appear when I search in the start menu.
I have very basic computer knowledge and have simply followed the onscreen instructions and not altered anything else.
It works perfectly on my windows 7 and 8 machines.