The PC Technicians Guide to Profits 

The PC Technicians Guide to Profits is for any mobile computer service person already on the go or for the novice interested in starting a home-based computer service business
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CompDoctor 

CompDoctor is a reference tool that helps you fix bugs without having to take your PC out for repair or having to pay for someone to come in your home and do it for you. Browse through symptoms and cures, or search by category or symptom keywords.
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