There's a lesson in here somewhere. You may find it best all round to do a reinstall. You mention a disc. Is there not a recovery partition on the laptop itself. It will bring it back to how it came out of the box, so you need to back up all data/pictures etc on a flash drive. Make sure you know any network keys you may need and reinstall.
Then make sure you use a proper backup regime. Was no backup software bundled with the lappy. If not get Acronis and use it to do running backups on the D partition. You will never regret it and believe me you WILL need to recover from some mishap again. Windows updates can break things !