iolo System Mechanic Premium - Unlimited PCs (install it on all your home PCs) Automatic Updates -- When you install and activate the software, it will automatically download the latest version to your computer. Compatibility -- Works with Windows 7, 8, 8.1 and Windows 10. Unlimited PCs -- Installs this tune-up utility on all the PCs in your household Powerful Tools -- Fixes errors and crashes; Restores system speed; Cleans up system cluster; Frees up trapped RAM & boosts processor speed. Improves your PC performance by defragging hard drive, repairing Windows registry, and tweaking CPU and RMA usage, etc. Privacy Defense -- Permanently wipes sensitive data. Recover Erased Files - Recovers accidentally deleted files even after the Recycle Bin is emptied.