There are many reasons why Windows registry errors are generated. A
registry can become corrupted by invalid or outdated entries,
uninstallations that did not complete or failed, and data that is
fragmented and empty spaces.
If you want to keep the windows registry in top condition, you will
have to fix registry errors regularly. With the availability of
registry cleaner software, you can clean up the registry of invalid
entries that will achieve a faster and error free performance of your
computer in no time. Simply download any registry repair software,
install it and most will automatically fix registry errors.
In addition, a registry fix software is a registry cleaner that allows
your windows registry to be repaired to fix these various registry
vulnerabilities, which will then improve your computers performance.
You need to look for a good reliable registry cleaner that will offer
registry backup before it deletes the invalid registry entries, that
way, if you need any particular registry entry in the future, you can
restore it instantly....

Registry Repair: http://groups.yahoo.com/group/regrepairsbv