What do you suggest

There are so many registry cleaners nowadays. Maybe somebody knows what is the most effective.

My computer has been super slow lately and it's getting really frustrating. I've been told that I need to install a registry cleaner. Would that really help? Where can I download a FREE registry cleaner from the net that also works effectively?

how can i clean windows vista home registry.because i kept installing programs and uninstalling them and some didnt uninstall right

I really want good virus protection, so can anyone tell me which company or software is good please. =]