My computer has been used for a while, then the display screen keeps turning black, although I have changed the desktop background. Moreover, on the desktop appears the message of "You may be a victim of software counterfeiting". Is my computer infected with virus?
The warning of “You may be a victim of software counterfeiting” is not caused by virus. This is Microsoft's warning regarding Windows copyright. This warning may be because your computer is not licensed to use Microsoft Windows operating system.
To remedy this, you should visit http://windows.microsoft.com/en-us/windows/genuine for more information and solution.
Good luck !