Problems with external screen resolution in XP

[Radio Monk33]

Hi guys I got a penryn MBP with up to date drivers and I just picked up a Samsung T220 1680x1050 that works fine in OS X but I can't seem to get this resolution to work right under XP. It does not show the whole screen and when the cursor moves to the edge of the screen it scrolls/pans from side to side like it doesn't fit. Any thoughts on how I can fix this?

Thanks!

[DownburstX]

I got the same problem on my MacBook Pro late 2008.
In OSX I configured my Samsung 206BW with the native 1680x1050 resolution. In XP i can choose the right resolution and it will show the resolution in 1680x1050 only with the DPI of something like 800x600. So the the external screen shows only a part of the native resolution and I have to scroll/pan with my mouse too see the other parts!
I hope somebody can help us. :(