Mathieu GRENET wrote: > I already set testsigning on, a,d the error is after that. Hi, Vista (and maybe Win7) have a log file in c:\windows\inf\setupapi.dev.log that should have some hints when a driver install fails. Presumably Win8 has something similar. [Sorry, I don't have a Win8 install, since it isn't released yet.] Graeme Gill.