This handbook is designed to help you find ways to maintain your Windows PC and ensure it remains clean and speedy throughout its life. Computers quickly get bogged down by junk files, invalid registry entries, a fragmented hard drive, spyware, adware, low disk space, and more. A speedy system is just a few clicks away, but sometimes it’s hard to know where to start or even what to do. I set up PCs for companies, friends, and family; the advice I give in this manual is what I use when maintaining any PC. My tips are tried and tested and have.