Sophos Management Services error while trying to open

Hi,
I installed on my PC Sophos Antivirus and it doesn’t want to start. I tried to start it manually and is not working. When I tried to start it from Services this error appeared. I can’t start Sophos at all. Can anyone tell me please what is the problem ? How can I solve this ?
Thanks !

Could not start the Sophos Management Service service on Local Computer.
Error 0x80070534: No mapping between account names and security IDs was done.
OK
