Posted 23 January 2013 - 03:39
Take the time to make sure his PC is up to date, browsers updates, everything.
As for his browsers,
if he's using Firefox: Make sure to install AdBlock Plus, and NoScript.
if he's using Chrome: install Adblock, and Disconnect.
if he's using IE9/10: Install the FanBoy and EasyList adblocking TPLs. Also make sure that SmartScreen filter is running.
Should help him in the future. They'll prevent arbitrary code from running. Also make sure any and all unneeded addons are eliminated.
Also, if possible, remove him from the default administrator account. If he's going to keep calling you for help, just set yourself up as the administrator. Lol. It's what I did for my parents, and as annoying as it was for them, it worked. They couldn't run anything without my permission.