Excel 2010 Format & Save As problem

I have a problem when using Excel 2010 in that when I 'Right Click' a cell to change something like Fill or Border etc, the Format box is hidden behind the work book? I have found that by switching to Outlook and then Minimizing it, the Format box is shown. However, when I click anything to try and change, the box disappears again behind the work book? The same thing happens if I try 'Save As'? Very frustrating!