You are probably going to hate me for this but the answer to the computer virus problem is Linux. Windows has been designed, by accident, to be particularly vulnerable to virus infection. Linux isn't. Also the number of people using Linux is not currently large enough to attract virus programmers. And even if people did write viruses for Linux, as long as you keep your data separate and backed up, it's a doddle to wipe the drive and re-install the system. Linux is free. It's probably easier to install any of the Linux systems than Windows. It's not rocket science, any one can learn to do it.