I've created a guest os vm (server 2008 r2) in my hyper-v environment. I added the integration services disk to the cd-rom drive. When I try to run setup it comes back "integration services is already installed" yet it's not loaded the drivers and I don't see it in Program and Features. I'm pretty much perplexed so any troubleshooting assistance someone could give me would be much appreciated. By the way I have rebooted the vm several times and all windows updates have been installed.