Make sure you get WinPC Defender, not WinPC Antivirus. WinPC "Antivirus" basically reports fake infections and the like, to scare people into buying the "full-version" so that the "infections" can be removed.
Luckily if you've accidentally downloaded and installed WinPC Antivirus, removal instructions are available here: http://www.2-spyware.com/remove-winpc-antivirus.html
Luckily if you've accidentally downloaded and installed WinPC Antivirus, removal instructions are available here: http://www.2-spyware.com/remove-winpc-antivirus.html