before you reinstall Operating System, you should uninstall the existing OS then after then thats the time you can do OS reinstallation.

but IF you know how to do system restore the do so.

QUESTION

what OPERATING SYSTEM are you using?

Thank you and Best wishes

**Dont get discourage when things go beyond your imagination because the greatest glory in life is not falling but rising everytime you fall. Life is what you make it**