I agree with the excellent advice from TrekDozer regarding registry cleaners and would like to add my opinion that they should not be used, this includes both commercial and freeware versions. Due to these type of program's advertising hype far to many users do not realize the substantial risk involved running such a program. See the below links for more information:
This can occur because whenever you install or uninstall software, adjust hardware or change settings, the Windows registry is updated. Over time the registry starts to.
Is it advisable to use Uniblue Registry Booster?
(see Ken Blake's (Microsoft MVP) post for additional info and links)
http://answers.microsoft.com/en-us/windows/forum/windows_7-performance/is-it-advisable-to-use-uniblue-registry-booster/b40f0fc8-442b-4352-b427-860c2c29091b
(see Ken Blake's (Microsoft MVP) post for additional info and links)
http://answers.microsoft.com/en-us/windows/forum/windows_7-performance/is-it-advisable-to-use-uniblue-registry-booster/b40f0fc8-442b-4352-b427-860c2c29091b
Don’t pay for software you don’t need — Part 2
(see Some Registry cleaners do more harm than good)
http://windowssecrets.com/top-story/dont-pay-for-software-you-dont-need-part-2/
(see Some Registry cleaners do more harm than good)
http://windowssecrets.com/top-story/dont-pay-for-software-you-dont-need-part-2/
AUMHA Discussion: Should I Use a Registry Cleaner?
http://aumha.net/viewtopic.php?t=28099
http://aumha.net/viewtopic.php?t=28099
IMO, the below recent article from PCWorld.com is an excellent read:
Uniblue Registry Booster 2016 Serial Key
Cleanup Utilities: Can They Speed Up Your PC?
http://www.pcworld.com/article/230447/cleanup_utilities_can_they_speed_up_your_pc.html
http://www.pcworld.com/article/230447-2/cleanup_utilities_can_they_speed_up_your_pc.html
http://www.pcworld.com/article/230447/cleanup_utilities_can_they_speed_up_your_pc.html
http://www.pcworld.com/article/230447-2/cleanup_utilities_can_they_speed_up_your_pc.html
Regards,