Sophos Endpoint Security and Control forced to close

Hello,
After a short time the install of Sophos this error message box appeared and closed the antivirus. The antivirus is compatible with Windows 7, the installer is OK and was downloaded from a trusted source. Can anyone help me please to fix this one ? What could be the problem ?
Thank you !

Sophos Endpoing Security and Control has encountered a problem and needs to close
Error information
Description: A system exception was intercepted.
Error message: The thread attempted to read from or writhe to a virtual
Source: CMainFrame::OnClose, line 576
Parameter: No parameter available
Close Details>>
