A colleague of mine was invited to download Rapport this morning, after which both IE7 and Firefox refused to function. It's not possible to uninstall it - it worms its way into your system like a virus, and can attach itself uninvited to other websites you use. There is also a feature to activate it on websites by choice. It's just taken me an hour and a half to get his PC up and running again, although of course Rapport is still there.
I spoke to NatWest Security department, and they admit that a large number of their customers are now unable to open their browsers and use the Internet. This link gives an idea of the problems