If you want to completely wipe the drive of all data, you can either simply reformat it or use a nifty program called Kill Disk
. Doing so will remove everything
from the drive including the OS.
The only real way of cleaning up your drive without formatting and reinstalling the OS is to uninstall all unneeded programs and delete any files, folders, music, etc. that you no longer need. You can also run a program called CCleaner
that will clean up the registry and removes unused files from your system.