What a problem! :O
You have these options:
If you have any restore points, restore to it. Only programs and drivers and settings will be affected. This is if:
- You have a restore point.
- You can access this
Otherwise, you can't do this option.
You'll need your Windows USB/DISK. Insert them and run the setup. When the option comes, choose "Upgrade this PC" (If the option was chosen automatically, and it didn't show up, then it automatically chose "Upgrade". Let the installer guide you through the rest. This is only if you have a installation cd/usb and you can access these.
This is an option that will remove all your files, all your documents, etc. You'll start off new. Insert your WIndows installation CD/USB and reinstall windows from scratch.
- Contact Microsoft using Live Chat/By telephone
All in all, I hope I helped and if I did you can give me a like.