External harddrive won't show in windows explorer Windows 7

I have an interesting problem or so I think it's interesting. I have a n HP Pavilion DV6-7001ax,  Windows 7 Ultimate 64bit just turned a year old.  My problem is I had a 1tb western digital My Book Essential it's alos about a year old.  Two days ago for some reason It stop showing up in windows explorer.  I tried everything I know to get it to come back but no luck.  I thought the drive was dead, however I hook the drive up to my wife's desktop and after it installed the drivers it works just fine, she's using Window 7 Ultimate x64.  I tried it in my daughters laptop, she has a HP Pavilion also model under mine, the drive works just fine she's using windows 8 64bit and I have another laptop wich has Window 7 Home Premium 32bit and the external drive works just fine on it.  So I tried and tried and tried but it won't work.  My wife and daughter both have a 1tb seagate external drive and both work just fine on my laptop.  Note: I've plugged in several different USB devices and they all work except my WD external drive.  Any advice would be greatly appreciated. 
Signed
Seriously Frustrated  

AntonBC57,
Turn off the computer.
As you turn it back on tap the F10 key. This will load BIOS setup utility.
Press F9 to load defaults.
Press F10 to save and exit.
When the computer boots back up, check to see if everything is working.
Open up command prompt and run the following command SFC /scannow.
This will scan the system files and correct any errors that it can.
Here is a link to command prompt.
When you go to open command prompt, right click and run as administrator.
Since it has not been to long since the problem started, you can run a system restore.
This will take the system back to when everything was working correctly without affecting your personal files.
Here is a link on how to do a restore.
Let me know how everything goes
Have a good day.

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