Unstops.biz/wpad.dat can be considered as a vicious redirect virus which serves as s main source for your PC system problems. And it is an profits oriented application. Its developers always have a business relationship with the owners of unknown and malicious sites and freeware. And that is the simple reason why it tries its best to harm your PC.
And then, if the sole goals of Unstops.biz/wpad.dat is just for money, how could it damage your PC? Actually, sometimes it does not mean to do harm to your PC, but it is subsidiary effects; but sometimes your harmful PC is a tool for it to make money. In the first circumstance, the goal of Unstops.biz/wpad.dat is to gain profits from the sponsored websites and freeware. And it will exert its best efforts to For example, it will display numerous unstops.biz/wpad.dat ads in the forms of banner ads, pop-up ads, in-text ads, video ads, sound ads, etc..and when you are tempted to click it, you are redirected to visit suspicious websites or download the freeware. And then, when these items have cumulated to a certain amount, your PC crashed.