Try disabling SecureBoot for the hell of it. Just to test. If it works, then SecureBoot is stopping it. If it doesn't, something else is wrong. I imagine the Surface tablets like my HP tablet are probably pretty locked down but I got the AG working perfect on both. Also, are you using a different key per computer? Each PC has a different Machine ID and has to be used to generate the license for each PC. Just a couple ideas. @Everyone else, if you post a debug log, please use pastebin or put it in a code tag or something so it doesnt make the page longer than necessary reading logs for people who cant help with the log issues.