Blender is not on the start menu The blender shortcut says it's pinned to start as shown in the photo, 

but when actually looking through the start menu or the Windows search, it's nowhere to be found.
To solve this problem you can copy the blender shortcut and go hit the WindowsKey+R or search for Run. Next type %appdata%\Microsoft\Windows\Start Menu\Programs and hit enter. Then a folder will open, just paste the shortcut into the folder and it should show up in your search bar.
Next time please ask questions as such on https://superuser.com/