The latest statistics have shown that about 96% of computers have
partially corrupted and other unsafe files on their hard drives which
is the primary cause of operating system errors. You see, basically
whenever you add and remove software from your computer your windows
registry is prone to become fragmented and full of errors due to the
constant changes in the configuration settings. This leads to a large
amount of partially uninstalled program files still littered over your
hard drive which causes the performance of your computer to decline
severly. Failure to repair these problems can result in total system
failure and the blue screen of death where you will no longer be able
to access the operating system and will have to reformat your hard
drive.
Why Registry Errors Occur
Registry errors occur mainly as a result of an excess number of unused
entries in the system. As time passess and you utilise your computer
more often you will add and remove software programs which leave
residuals that will litter your hard drive and cause it to become
slower. These partially uninstalled programs will take up memory usage
and cause your pc to become sluggish. Spyware infections can also
corrupt registry keys in which you may also have to make use of a
spyware removal program to help the process....

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