In Office 2011, the Office Gallery opens automatically – by default, when you open Excel, Word or the PowerPoint Files. If you want them to be opened as a blank document / workbook or presentation. you can do it very easily.
Preventing Gallery from opening automatically while launching the PowerPoint, Word and Excel. :
Open up the Word / Excel or Powerpoint. Obviously Gallery will be opened by default. Now select the option saying, Don’t show this when opening Word (If you have opened Word) / Excel (If you have opened Excel) or Powerpoint (If you have opened Powerpoint).
Now select the blank document / workbook or presentation and click on the Choose button. You’re done. From now onwards, Gallery will not open while launching the Word / Excel or PowerPoint.
Enjoy!