Hi,
Right-click the desktop, choose properties. Go to the settings tab, click
advanced. See if there is a tab
with advanced settings. Nvidia cards with a full driver set have an option
to invert the desktop, you (or someone else) may have tinkered with this
setting.
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Best of Luck,
Rick Rogers aka "Nutcase" MS-MVP - Win9x
Associate Expert - WinXP - Expert Zone