If you are thinking of installing an application but aren't quite sure what it's going to do to your computer, I would absolutely recommend creating a restore point before you install that application, and here are the steps to do so. Note that most application installs automatically create a restore point, but you can do this if you are really worried. Open up the Start Menu and right-click on "Computer", and then select "Properties". This will take you into the System area of Control Panel. Click on the "System Protection" link on the left hand side.

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Now select the "System Protection" tab to get to the System Restore section.

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Click the "Create" button to create a new restore point. You'll be prompted for a name, and you might want to give it a useful name that you'll be able to easily identify later.

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Click the Create button, and then the system will create the restore point.

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When it's all finished, you'll get a message saying it's completed successfully.

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Now if your application blows up Windows, you can restore your computer using System Restore.