in my office everyones pc uses windows xp pro and rarely have problems,windows will cease support in april for windows xp though . I have windows 7 on my home laptops and i like that. Cant get used to windows 8 as dont like the no start menu and cant get the 8.1 upgrade as it says my screen resolution isnt big enough and drop down menu hasnt got a bigger one .. always used to use firefox browser but used google chrome for a while now and rarely have problems with it.