A couple of days ago my mother asked me to set up a computer at his house, she wants to use it to basic web browsing, video chat and nothing more.

The problem is, neither my mother nor my sister know anything about using or maintaining a computer.

What I want is to have a working base install of windows 7 and just discard everything installed, downloaded, ... when it reboots. That way I can set up a partition just for saving files and whatever they do the computer will always return to a working state at start up.

can that be done?

PS: Sadly linux is not an option since my sister wants to be able to play some games with my steam account and not all of them run with wine.