A dedicated computer might be an alternative solution to hackers?

We are so worry about the hackers will hack into our site, or our computer to gain control of our information stored online or in our computer. Whenever we are surfing the web, or doing some financial, information senstive process. There were many hacking techniques applied by the hackers we may not even know.

What about a dedicated computer to do what specific work we need to do. No surfing the web, no checking mails, or chatting. Just do whatever it suppose to do. For instance, to compile a financial statements, a computer only has to do it, and no other jobs. Don't you think that is one of the best solution? Nowadays, a computer not gonna cost too much.