From Macecraft Software:
PowerTools Lite 2013 is the freeware edition of jv16 PowerTools Windows utility suite. PowerTools Lite 2013 allows you to easily clean up your Windows registry, fix registry errors and immunize your computer against known online threats.
With PowerTools Lite you can:
Automatically clean your Windows registry from obsolete and unneeded data.
Automatically fix many kinds of registry errors, such as broken file references.
Detect and remove unneeded history data and MRU (most recently used) lists that can contain sensitive information about you.
Protect yourself against online threats.
The bottom line is that PowerTools Lite makes your computer run smoother, faster and greatly improves its overall stability. And it doesn't cost you a dime.