Using another computer, download the programs to a flash drive or CD and transfer them to the problem computer.
You won't be able to do the ESET scan.
You can look at your browser(s) add-ons/ plugins/ extensions and disable or remove the ones you didn't install or recognize.
You can check your Add/ Remove program list for toolbars/ browser protectors that have been added by security programs such as AVG.
“Every atom in your body came from a star that exploded and the atoms in your left hand probably came from a different star than your right hand. It really is the most poetic thing I know about physics...you are all stardust.”― Lawrence M. Krauss
A 1792 U.S. penny, designed in part by Thomas Jefferson and George Washington, reads “Liberty Parent of Science & Industry.”