fastest way to clear disk space

[Randy5]

I can't run Windows Vista because I don't have enough disk space. What's the fastest/simplest way of clearing up some space?

[suwunk]

If you want to reduce the number of unnecessary files on your hard disk to free up disk space and help your computer run faster, use Disk Cleanup. It removes temporary files, empties the Recycle Bin, and removes a variety of system files and other items that you no longer need.
Optimize Windows Vista for better performance (http://windows.microsoft.com/en-US/windows-vista/Optimize-Windows-Vista-for-better-performance)