Spam (Not The Kind You Eat)

I am by nature a very suspicious person. That suspicion comes from extensive observation of everyday people and how they interact with each other and with me. I am very suspicious of certain activities, both within the government and in the private sector. A suspicion of recent concern is that of software companies and how they conduct their business. I am certain that very unethical practices are at work, but I have no possible way to confirm those suspicions. As a recent example, I was at work on my computer when a pop-up announces "Your computer is running slow; Click here to fix the problem". There is no X button to click on, so most people will click on the "fix" button. A new message appears that offers a free scan, so you continue. The scan goes on and comes back with hundreds of problems that need to be fixed. You click on fix and you are now on a screen that is offering some fix for a sum of money, usually $19.95. I don't want it so I finally find out how to get rid of the spam. Another message appears offering a onetime half price of $9.95 for protection. Again I refuse. Now the funny thing is; shortly after turning down the offer, a new message appears saying a "Trojan Horse" virus has been detected and has been taken care of. I click the OK box, but the message keeps popping up, interrupting whatever I'm working on. If I happen to be doing word processing, the message stops any further word processing. I finally had to restore my computer to an earlier time. Does anyone know anything about my suspicions and what if anything can be done about it? Is there an agency like the BBB who keeps tabs on such practices? As I said, I have no proof, but I'm 100% certain such practices do exist. These anti-virus and anti-spam software companies must be doing something to make their money. The threat of a virus usually gets most people to respond to their pitch. They may not be illegal, but most certainly unscrupulous.