First things first...
guccilvr suggested checking the 'performance' settings. Sound advice, although his suggestion works backwards for me, if that makes any sense.
I mean, the slider he mentioned...If it's too far left (good for screenshots), the video won't full screen at all. The slider has to be either halfway or all the way right for WMP to consider going 'full screen.' So, if I were you, I'd play around with the settings a bit.
Quote:
Originally Posted by Straight from Microsoft themselves...
Make sure your screen saver isn't kicking you out of full-screen mode. Also, turning of the Enable full-screen mode switch feature might solve the problem. In Windows Media Player 9 Series or later, do the following:
On the Tools menu, click Options, and then click the Performance tab.
Click Advanced.
Clear the Enable full-screen mode switch check box.
Note that for Windows XP, full-screen controls disappear if you stop moving the mouse and the cursor is not hovering over the controls. If you want the controls to disappear more quickly, you can clear the Display full-screen controls check box (also located on the Advanced dialog box). Or you can use the TweakMP Powertoy for Windows XP from the wmplugins.com page to adjust full-screen settings.
Addendum: They also suggest updating directx (click here)and updating the player itself (click here) - guthmund
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Plus a screenshot...
If worse comes to worse and none of the above works, you could try to get rid of WMP and then re-install it.
To uninstall WMP, the option is there...it's under add/remove windows components. Once it's 'gone,' running Windows update should walk you through the re-installation.
Screenshot:
I hope this helps...