Try restoring your computer to an earlier restore point. This would resolve the issue. Then configure your Windows to notify you about the updates without downloading. You can then manually select each update to download and install them one by one. Check the taskbar behavior after each update installation.
As soon as the issue re-occurs, remove the most recent update from the computer and continue with the other updates installation process.
This approach is time taking but it will help you identify the problematic update.
Hope this helps.