Whenever I go to a page and this ad loads, It is literally impossible to scroll the page up or down and if I can it always moves very slow. I always wait until the ad finishes loading before trying to scroll but it does no good. The Yellow Book ad is the only one causing this.

Everytime the yellow book ad comes up my computer gets stuck and I have to close the window.

I've not experienced any problems with those ads using Internet Explorer and Windows 7, but they've been disabled and should no longer appear.