i have dell netbook with no cd drive and it has got some kind of virus will not allow me to do much so want to go back to factory settings tried cmd f11 but no deal ????
First try and fix the problem.
AVG Rescue: Create a bootable USB thumb drive & virus scan. There are also some utility programs like Midnight Commander that will let you find any personal files you wish to rescue. http://www.avg.com/us-en/226386