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If the Oxford Sophos Antivirus Installer fails to install Sophos for Windows it will display a red shield and the message Install Failed. There can be a number of reasons why the installation fails but the most common reason is that you already have another antivirus software product installed such as a product from Norton, Mc Afee, AVG and others.
If you already have up to date antivirus software installed and protecting your computer then you don't need to install Sophos as well.
On Windows and OS X systems the shield may occasionally disappear for a short time while Sophos is installing updates.
Normally however it will reappear within a few minutes.
Occasionally the Sophos client cannot connect to the Sophos update servers because they are unavailable for some other reason, such as a temporary internet problem.
Sophos for Windows version 10.0 runs on Windows 7, XP (SP1a and above), Vista and 2000 (SP3 and above).
If you can see the blue shield when you do this then everything is running normally.
However because the shield is hidden it does mean that you are more likely to miss problems with your Sophos installation.
This indicates a problem which needs to be investigated and fixed. Sophos will normally also display a message box to show you what the problem is as shown below. Blue and white shield with red circle and white cross If you see a red cross (some may notice that it's really a white cross on a red background) on the shield it means that the last time that Sophos tried to check for updates, it failed for some reason, perhaps because it does not currently have the required network connection. This is often seen if you are using a USB modem for your broadband connection.
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.Below is a list of commonly asked questions concerning Sophos Anti-Virus.