How to stop people from installing crap on your computer

[Psysim]

(2013-12-28 21:14)Leon Wrote:  Ok, I've created a guest account, but now nothing from the previous account can be accessed from the guest account. This includes Minecraft and such. How to fix?

re-install all the apps you wish him to be able to access, at the point of install you should be prompted with something like 'This user only or all users'.

Can I suggest if you are not using firefox yourself, installing it on his account with a plug-in called 'NoScript' which will stop javascript from running automatically, this will prevent malicious installs that are often hidden in web pages, these include things like ransom-ware. Also make sure (as much as its a pain in the arse) that UAC (user account control) is enabled, its a valuable security feature.

You'll find a link to user account control on the under the user account section of the control panel, I would suggest 'Default' as this will prompt him and make him aware of an install no matter how discrete the install is.