I bought my daughter an Acer aspire one for Christmas,she was fiddling around with it and it went blank,she doesnt know exactly what she's done but when we turn it on there is a task bar at the end of the screen with the home button on the left,when we click on it we get the error message"Could not run command :xfdesktop2 - -gohome : Failed to execute child process "xfdesktop"(no such file or directory)can someone help please. PS new to linux.