János, Tóth F. wrote: > I tried to reinstall the USB driver from Argyll_V1.6.1_src.zip after > uninstalling the old one (actually the same) and Windows 8.1 rejected it. > "The hash for the file is not present in the specified cataloge file." Are you running a system with Secure Boot (UEFI) enabled ? If so, does re-booting with "Disable Driver Signature Enforcement" allow the driver to install ? Graeme Gill.