The thing is, until post #8 we didn't know how user tradetime was running. In that same post he/she said to be running as a standard user. Therefore, you couldn't just say that unless the user runs IE, that UAC is useless. If you are an admin the virtualization is essentially useless. Yes.* If you are a limited user, it isn't. Right? Right. * Although, as user xxJackxx pointed out, you may run into issues if you disable UAC, once the applications have created their data in the virtualized file system and registry. I don't know how far the issues could go. So, if you (=anyone) had UAC enabled before, leave it enabled, even if just for virtualization and to keep things working... just in case.