The Windows registry is the computers storehouse of important
information. A Windows operating system stores all the information
regarding software, hardware, applications, settings and preferences
in the Windows registry. Whenever you make any changes to your system
or configuration, the registry is updated with these changes.
However, over a period of time the Windows registry starts building
up as entries keep getting added to it. The registry gets bloated
with information that is mostly invalid, corrupt, erroneous or
redundant. A bloated and corrupt registry full of errors adversely
impacts the working of your operating system.
The most common symptom of a bloated registry is the slowing down of
your computer. Operations that used to take fractions of seconds when
your computer was new will now start taking minutes to perform.
Booting up, opening and closing programs, everything starts taking a
lot of time as your operating system searches for relevant
information in a registry full of errors and trash. That is why it is
advised that you keep cleaning up your Windows registry periodically
or after installing and uninstalling programs....

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