CCleaner makes removing unnecessary files a breeze.

Step 2: Manage your files

After you've analyzed your usage with WinDirStat, it's time to quickly rid yourself of unnecessary files, such as application data for uninstalled software, temporary Internet files, and "recent document" lists. Enter CCleaner.

This helpful, free utility separates its optimization process into two windows, one for Windows and one for third-party applications. Simply select the items that you'd like to clean, such as Windows log files, Chkdisk file fragments, or Flash player application data, and then hit "Analyze". Depending on how many items you're analyzing, you'll soon have a list of files that you can delete.

Even though we're talking about smaller items on your computer, the number of files quickly adds up. Don't be surprised if CCleaner ends up saving you a few gigabytes of disc space.