Install Linux operating system instead of Windows. Linux Mint, which shares with other Linux distros, runs on low-power hardware. You can run Mint on any of your Windows 7 PCs. All Linux Mint needs to run is an x86 processor and x64 (latest version), 1GB of RAM (you’ll be happier with 2GB or 4GB), 15GB of disk space, a graphics card that works at 1024 x 768 resolution, and a CD/DVD drive or USB port. That’s it. Heck, you can run Mint on pretty much any Windows XP PC, if you have one around. Mi...