Some software gives you an option to remove that type of thing when you uninstall it. A lot of software leaves registry entries behind by design so if you re-install it your settings remain intact. Cleaning your registry won't improve your PC's performance. What's your definition of an 'undesired registry entry'? If it's one which causes something to run which you don't want running etc, then I guess it's undesirable, but if they're just 'orphaned' registry entries left over after uninstalling software etc, then they're not doing any harm. The best answer to get rid of the malware in this case is use the Windows System Restore. So I have to say that Revo Uninstaller Pro didn't seem to work in this situation. I was able to stop KMPlayer from showing as file type for avi, and other file types, before I ran out of my 1 hour time limit on the computer.

Since I knew I couldn't hurt the computer, I started manually (and rather sloppily because I don't exactly understand the registry) deleting entries in the registry related to KMPlayer. However, doing a search in the registry, I still found a huge number of KMPlayer entries, and KMPlayer still appeared on many file type designations.

It found many entries in the registry and I choose to delete all of them. Then I installed Revo Uninstaller Pro and choose'forced uninstall', 'advanced' on the string KMPlayer. As before, I looked at the registry and found maybe 100 entries to KM Player, and as before, KM Player appeared as the file type designation on many types of files, even though I supposedly uninstalled the program. I installed the malware ( KM Player) and then uninstalled it from the supplied uninstaller in the menu. On this computer you can install/delete programs and also edit the registry with regedit. When you turn off the computer, it re-images from some master file. This public computer is Windows 7, and can't be hurt unless you punch the computer. I was curious about this, so on a public computer, I decided to put it to the test.

It was mentioned in a previous post that Revo Uninstaller Pro could be used to get rid undesired registry entries from uninstalled malware.

Revo un installer