In the My Ebay section on Ebay, there is a drop-down box. wheneber i select it the whole page moves over to the left, and i have to scroll back over to the right to see the options which have dropped down

It's started doing this in the last few days. I've owned the pc for a couple of weeks and it was fine for the first week

Here is a video showing it DSCF9001.mp4 video by jiminwatford - Photobucket

thanks for any help
James