An older software application, but a freebie and a goodie, is WinDirStat. If you ever find yourself running low on storage space on your hard drive – this application will quickly and intuitively give you a peek into what is consuming all that space.
Before you go out buying a bigger hard drive, using WinDirStat to see if there isn’t (and there probably is) some unneeded files or applications consuming major amounts of disk space. You can delete these files/applications thus freeing up space on your hard drive and save yourself the cost of a new, bigger hard drive.
Warning: You can totally ruin your computer by deleting the wrong files – so don’t go deleting files you aren’t sure about!