For (almost) any program you can download you can save it's installer .exe file to a USB thumbdrive for purposes of backing it up (you would just plug in the USB drive to your computer copy the exe file from it to the hard-drive, remove the USB drive and then run the exe file to reinstall if you had ever accidentaly uninstalled the program) or for installing it on other computers (especially those without internet connections), i say this only works for some exe files as some (the installers for antivirus programs which want to update themselves immediately, or for adobe flash where you run the installer and it downloads some of the files it needs ,are examples) demand a connection during installation, whilst others contain within them all the data they need to perform installation of the program.
There are also some special programs (often described as portable) which don't need installation, you just run the exe file, these, like installer exe files can be saved to a USB stick or cd-rw or dvd, but when you plug this stick into a computer you can just run this sort of program straight away. Adwcleaner and most of the diagnostic and some of the virus killing tools on bleepingcomputer are already in this portable form, you can just download them normally and copy the exe file to the USB stick, then plug it into other computers to run it there. This setup won't run the exe file as soon as you plug the USb stick in, and in general it would be better to plug the stick in, copy the exe from the stick to the harddrive and then run the exe file from the hard-drive but it culd work to run the exe file straight from the stick in some cases.
Edited by rp88, 02 January 2015 - 11:24 AM.
Back on this site, for a while anyway, been so busy the last year.
My systems:2 laptops, intel i3 processors, windows 8.1 installed on the hard-drive and linux mint 17.3 MATE installed to USB