Autoruns - See what programs are configured to startup automatically when your system boots and you login.
WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
Autorun Organizer - Free startup manager with delay option.
WizTree - WizTree quickly finds the files and folders using the most space on your hard drive. It scans the MFT (Master File Table) instead of crawling the entire disk which makes it very fast.
Quick Startup - Quick Startup is an advanced startup manager to speed up your windows boot and solve the problem of slow PC system startup. It gives startup items information, reference and allows to delay auto-startup items.
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.