I do this for my mum, she wants to watch these P2P Chinese streaming video websites which I wouldn't trust with a barge pole, these sites insist on installing their own plug-ins. She doesn't have Admin access to her own machine, this prevents any accidental installs. If she needs something I log in using Teamviewer and sort it. re VM: I have setup a Virtual Box running Windows 7, then she can have admin within this VM and install anything to her hearts content. If it goes wrong, I trash that VM and restore a backup copy. This setup works well, she's not had any problems with trojans/viruses on her host.