Question code doesn`t work in win xp but works win 7 Pin

[royk]

I`m a beginner coder in c# and I have a project reading from XML file and than show it in datagridview. The code works great in win 7 and show the data as needed but when I tried to run in it in win xp, it reads from the file ok but only show the 1st column of the data. I don`t know what the problem is but it is not in the read process (I debugged it line by line) but ofcourse I`m missing something.
What can it be?
I don`t know it has any connection but I`m using win 7 64bits with VS 2008 32bit and win XP and VS 2008.