|The misuse of the term "reboot" annoys me. Reboot simply means to restart the computer; it does NOT mean to wipe & replace the OS.|
As DAVEINCAPS pointed out, doing a factory reset is like putting your computer in a time machine & taking it back to the day it was purchased. It may or may not fix your problem. You can't fix a hardware problem by reloading software, so be sure that's what you need to do. Hopefully you have backup copies of everything, just in case.
I can only guess from the partial model number that you have a Lenovo G530 notebook. DAVE already provided the method, but here's the instructions from the manual.
Restoring the factory contents from the service partition
1. If possible, save all your files and shut down your operating system.
2. Turn off the computer, and then turn it on again.
3. When the Lenovo logo comes up, immediately press the Lenovo Care button, F11, or Enter key. The Rescue and Recovery workspace opens
4. Click Full Restore and follow the instructions on the screen.
ATTENTION: All files on the primary storage drive partition (usually drive C) will be deleted in the recovery process. However, before any data is overwritten, you will be given the opportunity to save one or more files to other media.
message edited by riider