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What does your wallpaper look like when it is not locked? &nbsp;Black? &nbsp;When the machine is locked it should use the wallpaper/background that is normally set when logged in.
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What does your wallpaper look like when it is not locked?  Black?  When the machine is locked it should use the wallpaper/background that is normally set when logged in.

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Could it be because my wallpaper is in png format and not jpg or bitmap?
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Could it be because my wallpaper is in png format and not jpg or bitmap?

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yes thats what it was. &nbsp;problem solved
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Why not right click on the image and select edit.. In paint go file&gt; Set as background.
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Why not right click on the image and select edit.. In paint go file> Set as background.

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When I lock my PC (which is on a domain so it locks - not fast user switching), how can i change the background image from just a black background to a nice wallpaper? &nbsp;Using windows xp sp2.
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When I lock my PC (which is on a domain so it locks - not fast user switching), how can i change the background image from just a black background to a nice wallpaper?  Using windows xp sp2.

Change the wallpaper of a locked workstation

Microsoft Windows XP is the sixth release of the NT series of operating systems, and was the first to be marketed in a variety of editions: XP Home and XP Professional, designed for business and power users. The advanced features in XP Professional are generally disabled in Home Edition, but are there and can be activated. There were two 64-bit editions, an embedded edition and a tablet edition.