I've managed to pick up some kind of a bug on my PC.

When I start to type the name of a wesbite into the browser, of the first six or so letters match, it automatically completes to link to a porn site. I found this probem some months back and thought I'd fixed it. It only ever links to one site, but I've tried searching the PC (including the registry) for the name of the site, but without any luck.

Does anyone have any suggestions as to where I should be searching? Or what I should be searching for, if not for the actual name of the site?

This isn't a major problem, but it's getting annoying.