Windws 7 application problems (visiability)

I am a retired long time computer professional but have just upgraded to Windows 7 so a novice in that area.

Yesterday, I started having problems with Skype, I had just done something with it and was having mouse problems at the time, double arrows causing strange reactions, etc. so I thought I might have inadvertently done something I had not intended.

Skype would no longer display (be visible) on the monitor so I could not do anything with it.  It was on the task bar, would display the mini-window(s) but when one was clicked nothing appeared to happen.  [Note: the application may have actually been up but out of the monitors frame.  At times I noticed a movement flash going up and off to the left out of the frame.]  I tried numerous things to correct this; first rolling back the system to a time before the problem started, installing earlier versions of Skype all with no effect.  I also had a second account ID for use on my laptop, if I logged into that account Skype appeared OK.

All of a sudden, after hours, Skype started working correctly again and so far has continued to.  However, the problem still exist but has been transferred to "Control Panel" which I can now no longer see and therefore cannot get into to set system functions.  All other programs seem to be functioning normally.

Three questions, first, what is this problem I seem to have created?  Second, what causes it and is there a way to prevent it?  Third, how do I fix it so that I can get into "Control Panel" again and not have the problem transfer back to Skype or some other program?
MikeinfloridaAsked:
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CSI-Windows_comCommented:
Some programs remember their position off screen either because of a previous multi-monitor setup or a perceived multi-monitor setup.

First use the "Display" icon in Control Panel to ensure that Windows does not think you have more than one monitor if you do not.  It may do this with multi-port graphics cards.

This will prevent well behaved Windows software from appearing on a non-existent monitor.

Second, if it happens again, use the following key sequence to move the window (practice it on a visible window to see how it works):

Alt-Space
Press "m"
Use the arrow keys to move the window.

Once you've used at least one arrow key, the mouse may be locked to the window - you can then move the mouse - WITHOUT CLICKING - to move the Window.
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MikeinfloridaAuthor Commented:
I could not move the window but then I could not see it either.  The item was being displayed on the laptop's screen even those it was closed and supposed to be out of service.  I had one additional incidence of non-visible application and then I must have done something because there have been no further problems with it.  It seems the laptop screen is now actually "closed."
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Windows 7

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