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This drove me batty as well, until I found that this error can happen if Windows updates are handled automatically by WSUS – a Windows Server Update Services server. Many companies have these in place to push Windows updates out. Usually your computer will be on a domain if it is a company computer.

To get around this, try disabling the WSUS service. It will generally start back up the next time you reboot. Open a command prompt and enter:

net stop wuauserv

Exit the command window, then go try to check for updates again. Worked for me.

I keep all of my documents in DropBox and I don’t think that the 7z method works well in this case. My archive is over 15GB, and it changes if I alter anything, so the entire archive would be written to DropBox every time I make any document changes or add anything. Very inefficient.