If you righ-click on the bottom left corner of the desktop and select 'system' you should be able to find out which version of the OS you are using. Being a consumer-class model, unless you upgraded during purchase you are likely to have Windows 8.1 Home Premium version (can't confirm, of course).
In any case, you should be able to use ANY computer for office dutties as long as it meets your needs in terms of connectivity, performance, and applications
If you can expand on what you mean by 'office use', we might be able to provide more support