Their a bug going around where the task bar does work at all and the start button does work or the search bar and also make the pc slower after looking for a few day i found a fix that worked so far by these steps :
1- Right click on start menu and click on Run. "For those who the start menu does not respond with right click, right click on taskbar - click on Task Manager - from File menu on the left upper corner select Run new task".
2-White the command regedit and click Enter.
3- Go to path [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WpnUserService].
4-Double click on Start from the right side.
5-Change the value data to 4 then OK.
But you need a fix soon its broken
Moved from: Windows / Windows 10 / Windows update, recovery, & backup