If the methods above didn’t fix your problem, then type regedit in the Run dialog box and press Enter. It will open Registry Editor. Now go to the following key:
HKEY_CURRENT_USER Software Microsoft Windows CurrentVersion Policies Explorer
In the right pane, look for a DWORD NoStartMenuPinnedList value. If you find it, delete it. Reboot or log off and your problem should be solved.
If you cannot find the above mentioned key, then download the following ZIP file, extract it and run the extracted REG file. It will ask for confirmation, accept it. Reboot your system and your problem will be solved: