This document provides steps to optimize performance on a Windows PC, including fixing disk errors, removing temporary files, defragmenting the hard drive, running Windows updates, and installing antivirus and antispyware software. It recommends using the Disk Check tool in Windows to fix disk errors, using CCleaner to remove temporary files, and using Auslogics Disk Defrag to defragment the hard drive. It also recommends keeping Windows updates and antivirus software up to date. Following these steps regularly can improve computer performance.