Best PC optimizer

Just use what's built into Windows. Optimizers and especially registry cleaners are placebos at best and can mess up your computer at worst.

We do not recommend that you use any Registry Cleaners, Optimizers, Driver Updaters, Tune -Up utilities, etc.

They may do more harm to your operating system than any good that they claim to be able to do.

And this is interesting reading from Microsoft when it was available ( I kept a copy of it).

Microsoft have removed/changed the link but the information that they supplied still holds true.

"Are registry cleaners necessary?'

http://windows.microsoft.com/en-us/windows/are-registry-cleaners-necessary#1TC=windows-7

Warnings

• Some programs available for free on the Internet might contain spyware, adware, or viruses. Only download and install programs from software publishers that you trust. Even if you trust the website you download the program from, you need to also trust the

publisher of the program. For more information, see When to trust a software publisher.

• We strongly recommend that you only change values in the registry that you understand or have been instructed to change by a source you trust. Be sure to back up the registry before making any changes.