Lastly someone reported that he has trouble with accessing options/buttons located at the bottom of some pages/windows after he changed display settings. Try this: right click on your desktop > Screen Resolution > Make text and other items larger or smaller > select Smaller - 100% (default)... maybe it was changed in some way to medium.
If it doesn't help. Maybe you can make a print screen to show how it looks like. You can upload picture using this service: http://imageshack.us/ . Then you need to paste here a link to that uploaded image.