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I've downgraded Windows trying to fix the problem with the start menu, but it made it even worse (previously the menu just didn't open, now it still doesn't plus I get error prompt)
The problem is that Windows Update shows only some Internet Explorer patches and even they won't download, as the progress is always 0%
2Sure; Just install the newer build by installing the appropriate Windows Update. – Ramhound – 2016-01-04T18:33:02.263
From the description of your problem it sounds like a reinstall of your current version would be better. – DavidPostill – 2016-01-04T18:46:17.703