You need to backup everything you want OFF the laptop and place on memory sticks CDs DVDs or an external drive.
Any thing on the laptop will be lost.
Recovery is the best way to go as it will recover a full set of windows plus all the correct drivers and any pre installed softwqre that came with the machine.
If its a Medion it will have come with recovery disks as well as the separately save partitions
The Recovery Partition will have files named Factory.PQI FActory.002 etc these are images of the drive when new but you need the recovery CD to activate them.