We had a friend build us a computer when we lived in Thailand. Apparently they used a faux Microsoft so we bought the real deal. Went to install it and says we lack space but we have plenty of space. We have a plethora of viruses I believe, even the computer talks to us and tells us, and I want to get rid of them and put on the real Microsoft Windows. How do I do this?! We have nothing in the computer that needs saving. It is used as an internet tv and that's all, hooked up to the tv screen. Will pay more Simbi if needed!