Applies to: managed staff laptops. This has not been seen on managed staff desktops.
Symptoms
Laptop crashes with a blue screen showing an error message "DRIVER IRQ NOT LESS THAN OR EQUAL" in relation to file NETIO.SYS.
Work-around
Restart the laptop. If you use the Firefox browser then update it to the latest version (Menu > Help > About Firefox should show at least version 105.0.1).
Desktop PCs are not believed to be affected so moving to a desktop temporarily could help in persistent cases.
Root cause and fix
This is believed to be caused by a bad interaction between Firefox and Sophos antivirus. Updates for both packages have been deployed to managed staff PCs that were affected.
Status
Closed. (Updated 09/12/2022)