*READ THE INSTRUCTIONS*
1.Close TeamViewer,if it is running.
2.Click on START -> Run -> type %appdata% -> delete TeamViewer folder
3.Click on START -> Run -> type regedit -> Delete registry folder(right click->delete): HKEY_CURRENT_USER/software/teamviewer and HKEY_LOCAL_MACHINE/software/teamviewer
4.Restart PC
[NOTE] When installing TeamViewer choose "Non-comercial use"