I did a fresh install of Hyper-V on Windows 10 and could not connect to the localhost or start Hyper-V quick create.
Hyper-V Manager gave the error "object not found"
Hyper-V Quick Create gave the error upon opening "Error - not found"
Took hours to find the solution:
1. Remove the default Override system setting in Exploit Protection:
Open "Windows Security"
Open "App & Browser control"
Click "Exploit protection settings" at the bottom
Switch to "Program settings" tab
Locate "C:\WINDOWS\System32\vmcompute.exe" in the list and expand it
Click "Edit"
Scroll down to "Control flow guard (CFG)" and uncheck "Override system settings"
Start vmcompute from powershell "net start vmcompute"
2. Add your user or group to Hyper-V admin group in Computer Managmenet
Open Run and type compmgmt.msc
Go to Local Users and Groups
Groups
Add your user account or group to the Hyper-V Administrators group
FIXED!