Hello, I use the following lines to install arduino uno drivers PUSHD .\Drivers CertUtil -AddStore TrustedPublisher "Certs\CertDrv1.cer" CertUtil -AddStore TrustedPublisher "Certs\CertDrv2.cer" CertUtil -AddStore TrustedPublisher "Certs\CertDrv3.cer" CertUtil -AddStore TrustedPublisher "Certs\CertDrv4.cer" dpinst-x86.exe /LM /S /SE POPD CertUtil -DelStore TrustedPublisher "Adafruit Industries" CertUtil -DelStore TrustedPublisher "Arduino AG" CertUtil -DelStore TrustedPublisher "Arduino srl" CertUtil -DelStore TrustedPublisher "Arduino LLC" It works for Windows7 X86, but doesn't work for WindowsXp x86. On Xp works if i remove /S, and install with setup. Can anyone help me? TX, Marian