I cant get the full resolution in win7 i.e. 1440. This was not a problem with XP. Is there a d/l available?
Have you verified that both your monitor and graphics card is indeed compatible with Windows 7? The best resource to verify compatibility is available at the Microsoft Windows 7 Compatibility Center located at the following link: http://bit.ly/1gW6Ns and can be used for both hardware and software concerns.
Also, if they are both indeed compatible, have you installed the appropriate drivers for the GPU?