To attempt to speed up a very slow Windows machine, but only if nothing else has helped.In my opinion, registry cleaning is appropriate in only two cases: I’ve even heard from individuals who’ve had to completely reinstall Windows after running a registry cleaner that did much more harm than good. I do get reports of cleaners making things worse. The problem is, these types of situations rarely respond to cleaning they often require an application-specific or Windows-specific solution. Many people reach for a registry cleaner when an application is having problems or Windows is misbehaving. In my experience, most computers don’t benefit substantially, if at all, from a registry cleaning. Additionally, malware and spyware are often associated with these types of freeware, so they are often not recommended.Here’s one of the reasons I feel this way so strongly: My registry scanner reported hundreds of errors! How do I know which to fix? Registry cleaner risks Microsoft has never expressed the need for a registry cleaner or else it would have made its own. This is not so much of an issue in NT-based OSs like Vista and XP because of a different registry structure and improved indexing and memory management compared to Windows 9x versions. Manual cleanup of invalid entries, missing references or broken and invalid link registry entries becomes impractical because of the sheer number of entries, so finding the entry in question would be tedious, therefore the need for automation becomes apparent. The need for registry cleaners came about because older versions of the Windows operating system tended to slow down because of the size and complexity that the registry database after a while of use.

This type of utility exists because older versions of the Windows OS tend to slow down during boot up and exhibit errors when the registry becomes too big and cluttered.

Computer registry cleaner