Another place to look in Windows XP is the DPI (dots per inch) resolution in the Advanced area of the Display settings. So follow the same instructions Andrew gave above, but instead of the Appearance screen, go to the Settings screen. At the bottom right, click the Advanced button.

From here, on the first screen that comes up (General), there is a DPI resolution that should be set to Normal size. If it is Large size or Custom, then this can also throw off window orientation.

Also note on this screen in the bottom half is the place to set when Windows will apply new display settings (ie is a reboot required). Perhaps after changing settings you had to reboot the computer for them to take effect.

That's about all I can offer for Windows display and how Adagio may be affected.