Graeme Gill wrote: > Maybe a dummy .cat file containing an invalid signature rather than being > empty > might succeed ? Here <http:/www.argyllcms.com/argyllcats.zip> are a set of .cat files you can unzip in the argyll/usb directory, to overwrite the empty files supplied in V1.6.0. Delete the c:\windows\inf\setupapi.dev.log file (as admin), and try installing again in the usual fashion (ie. first disable signature enforcement). If it still fails, please mail me the setupapi.dev.log file. Graeme Gill.