The MSI log for Sophos AutoUpdate shows the following error:
Sophos autoupdate Error 3051. an error occurred while trying to create the user account SophosSAU<computername>0. Contact your support personnel
First seen in Sophos Anti-Virus for Windows 2000+
Open Computer Management or Active Directory Users and Computers (if a domain controller) and check for the presence of the specified account.
If neither of the above options work use the following article to create the service account manually 48910: Manually creating an AutoUpdate account
Finally, in some cases disabling User Access Control has been seen to help. Details on how to disable this can be found here.
If the account cannot be created manually, this indicates a system/environment issue that you need to resolve prior to installing Sophos Anti-Virus.
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