Almost all pc users will reach the point when their computers will
start performing slower and possibly become less functional in the
execution of programs. One vital system component which reflects
changes in this performance and functionality is the windows registry.
The registry stores information about system software and hardware in
the form of keys which get changed every time you add and remove
programs or hardware from your pc. The problem arises as a result of
the constant changes to these keys which will eventually result in
degradation of overall system performance.
In order to make sure that your windows registry will not become
fragmented you will need to use a registry cleaner to scan and clean
these errors. This will without a doubt drastically improve the
stability and performance of desktop navigation and the execution of
software programs. It is also highly recommended that you backup your
registry to a safe location to ensure that you can restore it should
something go wrong.This will happen if you accidentally delete an
important registry entry if you repair it manually.It is recommended
to do a backup but not totally necessary as these software programs
include such utilities and will almost definitely repair any problems
safely....

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