Android is a Mobile o/s for mobile devices. It's good in that it's OSS so it's constantly being improved and updated and there's constantly new softs for it. However the version you've got (2.3) is definitely seeing it's age now.
You can't change it to mobile Windows yet since it's a fairly new release and with it being a budget tablet there's no flurry of hackers attempting to break it so Windows can be installed.
You probably couldn't run office even if you could put windows on it. It's a budget tablet with only 512mb RAM and a single core processor, it wouldn't run much of anything once you consider how much RAM windows would eat just to run. Though there will be Android equivalent software if you care to check the appstore.