All updates are essential.
If you are using Windows 8.1 then you will need all updates from Microsoft to get further updates such as the long awaited 8.1.2 which is due for download next month via Microsoft store.
Microsoft are set to release Windows 9 to Windows 8.1 users as a free upgrade next spring.
If a reinstall has been done then updates can take a long time but an up to date PC will update every patch Wednesday, which only a couple a most.
Traa Dy Liooar