Welcome to the forums!
I'm better at erasing things than fixing software if you want to keep asking around for better opinions, but have you checked if there is a Windows System Restore point (look for it under programs/accessories/system tools) you could go back to when everything was working?
I may worry too much, but you might consider backing up before trying the System Restore which normally shouldn't cause too much problem, but if it's important, it's a good idea to have a back-up just in case things get worse.