I have been trying to resolve this issue for many months. I finally was able to fix the this today. The problem in my case turned out to be something wrong with my user profile. I tried removing programs and and all the many suggestions I found on Google but simply creating another user and copying the files/folders I needed to the new user and the scroll bars now work properly on all the MS apps (excel. Word. Etc.) The scroll bars smoothly scroll vertically or horizontally as I move the scroll bar. Hope this helps.