its on my computer
Let me guess, you are running Windows.
Never use Windows to store your wallets.
This is bullshit. Running windows, never had any wallets stolen. Stupid people will install malicious software no matter which os they use. From what I see most of bitcoin stealing stuff comes with altcoin clients/miners and other bitcoin related software, a different os will not protect you from any of those.
I never let the kids use Windows, although I virtually never use it except for work, where i use it over 90% of the time. On Linux, they can't install things because I don't give them root. And, if they managed to install anything, the program would be limited to their access. on linux, the default user access only includes write to their home and tmp, and no one can read another user's access.
Then you are a really shitty father. Your kids might want to play something called games, most of which require Windows. Sure you can use Wine, but how stable will be the games there? Also, most games like BF3/BF4 require Origin which is Windows only afaik.