Well, I like Windows 7, support for the past 3 years (since launch) and I am pleased with its user friendly features. And yes, I also do serious work. But anyway, I know that Windows XP is still used by many companies because it is considered as the best OS Microsoft today also. To be honest, there is no better than XP operating system to your needs. So I propose to continue with XP itself is better to go with Service Pack 3.