So you are actually then trying to 'restore' the device, as in go back to the original state (prior to any problems)? A reboot, as I said, is just turning the machine off and then back on.
If you are in deed trying to restore the device to its original state, like when it was purchased, then you are going to need to either have the needed data on the machine already (secondary drive or another drive partition) or you will need a CD/DVD/USB with the necessary data on it.
NOTE: These will only work if you can get into the system. They will not work if you can't even get into Windows.
In Windows versions prior to 10, you should be able to...
1. Go into "Control Panel" and then click "Recovery."
2. Next click "Advanced Recovery...