Logical Disk Manager Administrative Service and Task Manager messed up

Tech-Archive recommends: Fix windows errors by optimizing your registry

I went to change some drive letters and got this error window when I
clicked on "Disk
Management":

"The Logical Disk Manager Administrative Service is disabled, cannot
connect."

How can I enable it?

Also:
When I Ctl-Alt-Del and try to access "Task Manager" all I get is the
CPU Usage and
History graph window.

Did I remove some vital registry key/values when I did some registry cleaning?

Thanks
.