I have the strangest problem which I've had for many months now and really have to fix before it drives me mad - in any Microsoft Office program such as Word, Excel or Outlook, if I bring up any dialogue box in a program from the ribbon, it takes 2-3 seconds to open, and then 2-3 seconds to close afterwards, even if I select 'Cancel'. So, for example, if in Excel, on the home ribbon, in the font section, I hit the little square with the arrow to bring up the dialog, it takes 2-3 seconds to appear. On the other hand if I right click in a cell and seek to change the font that way, there is no time lag at all.
Will be quite impressed with anyone who can help me with this! (am a 20 year+ power user, and it has me stumped...)