Just downloaded Ccleaner. I analyzed the Registry and chose fix.... I did not backup since it appeared to me that leaving anything was not necessary. Now I am concerned that I did this too hastily and am "afraid" to turn off my computer for fear of not being able to turn it on.
Yes. Fortunately I've never had to restore the registry. You're probably ok, but in the future always backup. So cross your fingers, take a deep breath and reboot.