If the reason shown indicates a more significant problem than Sophos just needing a reboot then see the entry Sophos isn't running properly. The symptoms are usually that you see a red cross every time you start up the computer, but if you try a manual update, it succeeds and the red cross disappears.To start a manual update, right-click on the blue shield with the red cross and choose .Depending on the version of Sophos the shield may be solid (version 7) or appear as an outline (version 8). The current Sophos client will continue to update automatically until November 2012 at which point you will have to download and install a new version of the software.On Windows and OS X systems Sophos puts a shield icon in the system tray near the clock (Windows systems) or the system status bar near the clock (OS X systems). Solid black shield with cross in the centre On OS X systems running Sophos version 7 then if updating fails then you'll see a black shield with a cross in the middle of it. IT Services makes this new version available by the beginning of Michaelmas term every year.
On Windows and OS X systems the shield may occasionally disappear for a short time while Sophos is installing updates.
Sophos for Windows version 10.0 runs on Windows 7, XP (SP1a and above), Vista and 2000 (SP3 and above).
On the Mac, Sophos for OS X version 8 runs on OS X 10.4 - 10.8.
However because the shield is hidden it does mean that you are more likely to miss problems with your Sophos installation.
We recommend that you change the settings so that the shield is always visible as follows (this isn't an issue on Windows XP and Vista).
Normally however it will reappear within a few minutes.