Very easy if you have the application and support disc, which I think Medion always provide. The difference is , figure, the recovery disc is just the windows disc, so you would lose any software that came with your computer, plus you would need to reinstall some drivers.
I`ve used application and support on mine a couple of times, much quicker and easier than formatting and reinstalling windows.
I have Nero 7 and other free software that came installed on computer, so they`re still there on return to factory settings.