install virtualbox, create a clean vm with windows/linux installation, then run the client and keep your wallet in the vm.
Also back it up somewhere offsite, with a USB drive or something.
As long as you exercise good judgement and not install questionable softwares, you should be fine. A private person's computer is way harder to hack than an exchange, because due to the nature of running an website, it must have open ports, hosted with a 3rd party and publish it's IP address to the world.