The operating system is one of the most important parts of a computer. While technically it may not be hardware, it is necessary for a PC to be fully functional. Windows XP is still a very popular operating system, even thought Windows Vista was released long time ago. The question arises whether Windows XP will still be popular in the upcoming years. It may not be easy to answer the question that easily, but Microsoft has stated some time ago that it will stop selling Windows XP in 2010. There is an exception to this rule, specifically when it comes to very cheap computers being sold in China and India. Such computers will still have Windows XP pre-installed to make it possible to keep the price as low as possible.
Anyway, more and more people decide to install Windows 7. Windows 7 wild efinitely domiante the market in the upcoming years and it is only a matter of time.