i am getting my old pc ready for work and i need a ofice aplication for it. it has xp home. 2.8 ghz single core processor and >1gb ram. im tuck between putting office 2007/8 or open office on. i dont think it will be powerful enough to run office. how system heavy is open office? and can you open/make files that work with word as i will probaby transfer files over. thanks