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To get started, download and install WinDirStat. Go with the recommended installation.

Select the drive you want to evaluate, or "all drives" if you have multiple hard disks. Click "OK."

Updated:Caption:Photo:Screenshot by Sharon Vaknin/CNET
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WinDirStat scans your drives

Depending on how big your hard drive is, WinDirStat will take about 5 to 10 minutes to evaluate your drive.

Updated:Caption:Photo:Screenshot by Sharon Vaknin/CNET
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Find out what's taking space

When the scan is complete, you'll be presented with the summary screen. The top half lists files and folders sorted by file size. If you click on a folder or file, the corresponding color block will be highlighted below.

Updated:Caption:Photo:Screenshot by Sharon Vaknin/CNET
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Click the color blocks

Alternatively, click the large blocks of color to find out which files are taking the most space.

Updated:Caption:Photo:Screenshot by Sharon Vaknin/CNET
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Once you've identified the culprit, right-click the file and choose "Delete (to Recycle Bin)" for later disposal, or "Delete (no way to undelete)" for permanent, irreversible deletion.

Updated:Caption:Photo:Screenshot by Sharon Vaknin/CNET
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