It could be that you have dual screen display enabled. Right-click on the desktop and select 'Properties'. Then at the top select 'Settings'. If it is enabled, there will be a small ticked box down the bottom saying "Extend my Windows desktop onto this monitor". Untick this box.
kbp80
July 2009
I can answer this question...
why does my Windoes Media Player disappear when I click on it`s icon?
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Try fixfault.com to fix media players.