Reset Acer laptop to factory default setting

Here are the steps to reset Acer Laptop to factory default setting :
1 Ensure all Data is backed up, all data will be deleted.
2 Please also ensure that all USB storage devices are removed before starting the recovery process
3 Restart machine
4 When your unit switches back on, wait for the ACER screen then hold down alt & tap f10 repeatedly..

Then you choose restore to factory default.
All data in C drive will be erased and D drive will stay....