Works great - very useful
Glary Utilities - The No. 1 Free, Powerful and All-in-one utility for cleaning your PC
Autoruns - See what programs are configured to startup automatically when your system boots and you login.
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.
Tech Tool Store - Tech tool store is an IT professional application which contains more than 600 free technician tools packed in a simple, fully featured interface.
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode
Tron Script - Tron is a glorified collection of batch files that automate the process of cleaning up Windows systems.