i installed it 3 weeks ago when it was available for IT pros only and right off the bat all my videos had the audio out of sync in Media Player. i do a lot of video editing with uncompressed 8-bit NTSC files and they were all wacked out. For some reason this only happens in Media Player (i have version 9), so i promptly uninstalled it. the goofy looking security center didn't do much for me. this is a service pack for the novice user, but i'm sure that isn't news to anyone.