windows 8.1 – I have accidentally deleted all user variables and system variables

i tried recovering in many ways but of no use everything failed windows power shell,echo %PATH%,CMD admiinistrator not working gpedit.msn,registory editor,task manager,advanced system settings anything is not working showing an error type or enter correct name.

im using windows 8.1 pro version and 64bitOS X64based processor can anyone please help me in fixing this out :]