a- Reporting of errors
It is surprising to the see that a large number of advance registry optimizer tools simply ignore this requirement. The tools work on the presumption that the computer user is interested in only cleaning the registry and optimizing the same. While there is no doubt that a computer user wants a clean registry, his or her expectations do not end here.

The computer user wants to see the errors that have been removed. Many computer users do not understand the difference between Hkey Classes Root and Hkey Classes User in the registry. Yet, they would want to know which parts of their registry contained the problem. Hence, make sure you check the screen shots of the various advance registry optimizer tools before taking a final decision.

b- Depth of Scan
This, rather obviously, is very important. A scan of your registry can be ordinary or deep. The latter scan is an additional option that will offer extra protection to the computer using the advance registry optimizer. Not all advance registry optimizer tools offer this benefit. Hence, make sure you find out whether this feature is available or not.

c- Logs of the Scans
When was the last time you went through the log of your registry scan? Nine out of ten persons do not bother to go through the log. However, this does not mean the advance registry optimizer can avoid maintaining logs. If something goes wrong with the software, the logs shall be helpful in identifying the problem quickly.