Ok, I took the risk and got a Windows 7 iso file from a torrent site (no piracy here, I have the product key from OEM, and scanned it before using it). Did a upgrade install (to preserve my apps and other data), and it fixed my issues.
All Windows updates installed sucessfully. Pre repairs scan found no errors. System file checker tool found no issues.
Thanks to all that have helped me in this thread, as I wouldn't have solved my issues without them!