DTweak Free

You'll also find a Registry cleaner, a Registry defragmenter, ways to control the Windows Firewall, and plenty more. There's even a tool that warns you when the temperature of your hard disk rises above a certain level, potentially endangering your hard disk.

Note that there is also a DTweak Pro. This for-pay version offers additional features, such as a Hard Drives Monitor that tracks the health of your hard disk. For details, see our review here.

--Preston Gralla