I tried it several times on my home computer (which is also my work computer since I'm a freelance copy editor). Each time I tried it it fouled everything up so badly that I had to use system restore to go back to IE8. I discussed it with my ISP (BT) and they say that it's still in beta (yeah, right!), so their BT Netprotect Plus, which is McAfee based, doesn't work with it. Part of the McAfee stuff also doesn't work with the latest update to Firefox. Firefox will at least work properly, but you don't get some of the McAfee features.