John.
I've only just recently done this myself with my desktop.
It's quite easy, really.
I did a complete reinstall and it's working like a charm.
Do what programmer suggests...however, depending on your system, you might have everything you need already stored on your HDD for a full reinstall. It's often partitioned on the hard drive.
When you turn your computer on, you'll get an option to press f10 or f11 right before the start-up screen. Press it and follow the prompts for recovery or reinstall.
It worked for me.
Of course...you'll lose donloaded programs and emails, unless you backup before going through the process.
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