Run the following command as administrator
REG DELETE “HKEY_LOCAL_MACHINE\SOFTWARE\ATERA Networks\AlphaAgent” /f /v AgentId
REG DELETE “HKEY_LOCAL_MACHINE\SOFTWARE\ATERA Networks\AlphaAgent” /f /v AccountId
REG DELETE “HKEY_LOCAL_MACHINE\SOFTWARE\ATERA Networks\AlphaAgent” /f /v ServerName
sc stop AteraAgent & sc start AteraAgent