Unable to open Windows start menu in Coherence mode
One of Parallels Tools components (prl_cc.exe) hasn't been launched with Windows start.
Start your Virtual Machine
While on Modern UI ("Metro", with live tiles) screen start typing "task manager".
the search box will show up and the "Task Manager" will appear as a search result
click on Task Manager
Click on "More details" in Task Manager
Open Startup tab and look for "prl_cc.exe" or Parallels Control Center component
If there is no prl_cc.exe (or Parallels Control Center) component:
Go to C:/Program Files/Parallels/Parallels Tools/ (C:/Program Files (x86)/Parallels/Parallels Tools/ <- for 64 bit Virtual Machine) -> right click on prl_cc -> Send to -> Desktop (create shortcut)
Go to Modern UI ("Metro", with live tiles) screen and type in %appdata%
Press Enter. This will take you to “C:\Users\user-name\AppData\Roaming” folder.
Navigate to “\Microsoft\Windows\Start Menu\Programs\Startup”. The full path should now look something like: “C:\Users\user-name\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup”.
Put the prl_cc.exe shortcut you created at step 1 into the Startup folder.
Reboot the Virtual Machine and make sure prl_cc.exe (Parallels Control Center) runs with administrative privileges.