The error 'The on-access driver failed to attach to \fat' is displayed in Enterprise Console and in the Event Log on the affected computer when using:
- the 'Protect computers' wizard with 'Remove third-party software' selected in Enterprise Console, version 3.1 and above,
- or the Sophos Endpoint Security and Control standalone installer with 'Remove third-party software' selected
to remove Symantec Client Security, version 10.1 394.0, on a computer running Windows 2000. The error message may also refer to other non-NTFS files systems such as CDFS.
Sophos product and version
Sophos Endpoint Security and Control
What to do
Reboot the affected computers to remove the Symantec driver.
This problem has only been seen on custom versions of Symantec Corporate Edition. The issue occurs because the Symantec driver is not completely removed on uninstall, causing it to conflict with the Sophos Anti-Virus driver.