Windowed mode for L2 is easy as pie.
Click your Windows key (or Esc + Ctrl if you have an older keyboard) to return to the desktop. Rightclick on the Lineage II icon on the start-bar and leftclick on Maximize. L2 will go into Windowed mode. This works on Win XP just fine.
To go back into fullscreen, just rightcllick on the Lineage 2 icon again and click maximize again – and shazaam – back to fullscreen.
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Enjoy. ^^
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Lineage 2 Adena.
Just push Alt+Enter in game and your L2 will go to windowed mode…