I have a Surface Pro on which I have installed Office 2010 (it's the version I need for work so has to be 2010). When I am typing in Word it seems like approx. once a minute the computer has to think about something for a couple of seconds and any characters I am typing get missed. The swirly 'thinking' symbol appears and I can't type or move the mouse as though a background process is working. This is now getting quite irritating as whenever I type a sentence I am constantly having to go back to fill in the missing letters. Any ideas what this might be?