Windows won't switch unless I minimize

Say I have 3 different Window applications open - Excel, Word, and Firefox. I'm viewing Firefox, then I decide to switch to Microsoft Excel. When I click on the Excel button in the Taskbar, nothing happens. This is the case for all application windows. In order to view another window, I will have to minimize the current one. How can I fix this? It's a Windows 7 computer.
bobox00Asked:
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Gerwin Jansen, EE MVEConnect With a Mentor Topic Advisor Commented:
Does <ALT><TAB> work for you to switch between applications?

I have taskbar buttons set to 'Never Combine' (right click taskbar,properties to see options).
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bobox00Author Commented:
Alt+Tab did not work. I restarted the computer and the windows now switch over, when I click on the taskbar buttons. I will go ahead and run a scan. Any ideas on how to avoid a similar occurrence in the future, or what the problem might have been?
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LeeTutorretiredCommented:
This sounds to me to be a startup program problem.  Does the switching between applications still work in safe mode?  

Just in case it is a startup program problem, you might try the options listed on this page, especially the MSCONFIG one (method 3):

See this Windows 7 forums article:

http://www.sevenforums.com/tutorials/1401-startup-programs-change.html
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Gerwin Jansen, EE MVEConnect With a Mentor Topic Advisor Commented:
>> I will go ahead and run a scan
You have an up to date virus scanner and firewall?

You can try and run MBAM and see if you have some malware on your system.

http://www.malwarebytes.org/
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bobox00Author Commented:
There was an nVidia graphics driver available in Windows update. Installed it. Thanks for all comments.
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