A reader asks why, all of a sudden, Internet Explorer is jumping two pages every time they click in the scroll bar at the right of the window. The answer comes courtesy of Larry Seltzer at eWeek in his story Bugs, Old File Dates in New Microsoft Patches:
“The Cumulative Security Update for Internet Explorer, which addresses numerous security flaws in Internet Explorer 6, introduces bugs involving the scrollbar. After the patch is applied, the page scrolls up or down twice when the user clicks once in the empty areas of the scrollbar. Clicking on the scrollbar arrows or dragging the scrollbar thumb works correctly.”
Larry reports that Microsoft is aware of the problem and is working on a fix.
Meanwhile, do NOT remove this patch to resolve the problem. This is a Critical Update, and removing it exposes you to the risk that your computer will fall victim to any of several serious security problems, including having it taken over by a remote hacker.
Until a revised patch is available, try clicking the “thumb” (the variable-sized bar in the center of the scroll bar) and dragging. Or use your mouse wheel. Or use the up and down arrows at the top and bottom of the scroll bar, respectively.
Ed Bott 
Holy Crud I have been looking for the answer to this for a couple weeks now, I thought I may have accidentally installed some spyware junk that Spybot couldnt detect yet. I looked everywhere to find an answer for this issue, if anyone has a workaround I’m sure everyone and myself would love to hear it.(Besides using Linux instead of windows) 🙂
I have found that the PageUp and PageDown keys are an effective workaround for this problem. They are located between the “Pause/Break” key and the “right arrow” key on your keyboard. I’m still searching for more ways around this “problem” because I really like to use my mouse when I’m “surfing the ‘net.” Have a great day!