I Have a Sony laptop {VGN-NW250F) with a Intel Core 2 Duo CPU. The laptop came with Windows 7 Home Premium operating system. I want to upgrade to Windows 7 Professional so that I can run the applications that worked in Windows XP. I have read that some computers will not run Windows 7 Professional in XP Mode. How can I be sure that XP Mode will work on my laptop before I sped the money for the upgrade?