Changes to the registry by malware require immediate attention. In particular, malware is regularly designed to change the values of startup keys so it will be activated each time you restart the PC. Many types of malware attack and modify the registry. If your computer is turned off, crashes or dies without going through the normal shutdown routine, it could cause an issue in the future, but this is unlikely. Each time your computer shuts down, a copy of the registry is saved to system memory. The registry can also fragment when software is uninstalled, upgraded or updated. Registry cleaner software will state that your programs will be confused by the duplicate entries, slowing your machines performance, but that is not true. Duplicate keys are made when you reinstall, upgrade or update software on your machine, including the operating system. Registry cleaner software will often claim these are an immediate issue, but in reality, they will just use up a few kilobytes of free space on your disk. Orphaned entries occur when you uninstall software and small fragments of registry entries are left behind. Some are worth worrying about, and others are not. Issues caused by these utilities may not be repairable and lost data may not be recoverable.īut that doesn't really answer to my question, I asked if it is a good idea - assuming I know and trust the third party software - to install a reg cleaner and which one is the best.There are several common causes of registry errors. Microsoft cannot guarantee that problems resulting from the use of a registry cleaning utility can be solved. 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, and that you back up the registry before making any changes. Microsoft is not responsible for issues caused by using a registry cleaning utility.

For more information, see when to trust a software publisher. If you decide to install a registry cleaning utility, be sure to research the product and only download and install programs from publishers that you trust. Some programs available for free on the internet might contain spyware, adware, or viruses. Microsoft does not support the use of registry cleaners. I know about Microsoft's policies, it makes sense and I accept them :

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