I am pretty sure I have gotten this to work. Long winded approach though. First you need to start the install manually and when it stops at the untrusted driver stage look in the TEMP folder and find the sub folder that contains the extracted Clone Drive Files. Take a copy of the vclone.cat file in this folder. Cancel the installation. This may still say this has installed but the driver will not work. Just got to Add/Remove programs and remove it. Using the vclone.cat file from the files you copied right click and select properties. Select Digital Signatures Select Elaborate Bytes AG in the Signature list box. Click Details On the Digital Signature Details window select the General Tab Click View Certificate On the Certificate window select the Details Tab Click Copy to File On the Certificate Export Wizard window click Next I chose the Cryptographic Message Syntax Standard - PKCS #7 Certificates (.P7B) radio button and then ticked the Include all Certificates in the certification path if possible. Click Next Save the file to where you want to keep it. Click Next Click Finish Click Ok Close all the open windows. Now to pre import the certificate into the certificate store so that the software will install silently I used the following command line with administrative priviledges. certutil -addstore "TrustedPublisher" vclone.p7b This import the certificate that we exported before and now run setupvirtualclone.exe /S to install silently. So with a little prepartion it should be possible to completely silently install Virtual Clone Drive With these two commands. certutil -addstore "TrustedPublisher" vclone.p7b setupvirtualclone.exe /S