Startup Delayer - Startup Delayer gives you the power to optimize your Startup Process by delaying applications from starting up as soon as you log into your computer. By delaying the applications during start up, your computer becomes usable a lot faster.
WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
Autorun Organizer - Free startup manager with delay option.
TreeSize - TreeSize tells you where precious disk space has gone to.
Autoruns - See what programs are configured to startup automatically when your system boots and you login.
SpaceSniffer - SpaceSniffer is a freeWare (donations are welcome) and portable tool application that lets you understand how folders and files are structured on your disks.