Russel, I can understand your frustration, but at the same time, you have provided too little technical information in order for us to help you. Please fill in your system specs
, and let us know about the software that you have installed: what kind of factory installed tools are there, what's the antivirus/security software, etc.
Disk diagnostic is a first step, a virus scan is the next, system integrity check after that. These are necessary steps, but it could be that these are not your problems, but then we need to know more about your system to find out what is.