You could do but I'd be opting for a repair install.
With the current Win 10 ISO minus any recent updates, that would take you to 1607 14393.0 which is what the version was after the August update.
Subsequent updates bring you back up to 14393.693
If it was the August update that caused your problem, it may have been a bad install, but starting off with that version may resolve the Start button and Notification problems.
You can create Win 10 bootable media by using the Download tool now button, but read the section on creating installation media.
https://www.microsoft.com/en-gb/software-download/windows10When I perform a repair install, I opt for it not to look for any updates and then do a manual check for updates after.
I also fully disable my Norton Security prior to it as well.