Windows Update Not Working after months of being off

Hello there. I recently changed my settings for Windows Update, to let it check for updates, but now it always asks for a restart. I tried almost every solution, i don't know what to do, i need SP1 for SQL Server 2012 to work, but it's not installing. I even downloaded the update from microsoft's website, but the installer fails. I tried almost every method i found : - setting it to never...