Hirens BootCD - Hirens BootCD is a powerful, all-in-one boot disk utility that will help you resolve and make reformatting your computer easily.
Autoruns - See what programs are configured to startup automatically when your system boots and you login.
BartPE - Bart's PE Builder helps you build a 'BartPE' (Bart Preinstalled Environment) bootable Windows CD-Rom or DVD from the original Windows XP or Windows Server 2003 installation/setup CD, very suitable for PC maintenance tasks.
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Winbuilder - "WinBuilder is an engine designed to build and customize boot disks (Live CDs) based on...
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.