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The short answer to the question posed in the headline is: Yes, they can. Depending upon the free programs one is using. But the real question needing to be asked is: Are free registry cleaners worth bothering with in the first place? Especially with advanced operating systems like Windows 7 and 8. Because the registry can be a very complicated area to work with in a Windows system, the level of application-specific knowledge needed by an effective registry utility is high indeed. And anyone who has worked with free utilities such as Eusing or CCleaner knows that these only target the safest of entries to fix, while leaving a massive amount of empty outdated entries alone and untouched. You can find this out for yourself by running your favorite free utility up against the trial version of any of the commercial applications to find out which registry repair does the more thorough job. If you're not a very heavy user of your computer - meaning you don't do a lot of downloadin...

Let's talk a little bit about computer registry and registry cleaners. The registry is the holding area for the computer programs in your computer. Without a computer registry your computer would not boot up to the main operating system. There are literally thousands of lines of code in the computer registry. To keep all this code in order the registry is broken up into file drawers like a file cabinet. Each drawer holds the lines of code for the programs in your computer. When the processor of the computer is calculating the code for a program the computer processor goes to the registry and pulls the code it needs to process the request. The problem arises when there is junk files in the drawers of the registry, this can cause a fast computer to run slow. Over time the registry gets over filled with junk files or files that are left behind when you remove programs from your computer or bad links to files that lead to a dead end. When the registry gets overfilled with garbage fil...