|The previous Reply for your question is correct..|
There is no version of XP after Service Pack3
Also Windows has stopped giving upgrades for XP now..If you want to use an Upgraded version of Windows, then Buy Windows 7 but try it if and only if your Laptop Supports the configurations required for Windows7..
you can check if your PC supports Windows 7 or not.. Use this link to check your compatibility- http://windows.microsoft.com/en-US/...
Thanks and Regards,