Solve : "Another instance of setup is already running"?

1.	Solve : "Another instance of setup is already running"?
Answer» I run Testking software when I click the install prompt it flags an error and says "Another instance of SETUP is already running". I try it again to kill the duplicate process in the Task manager processes. When I killed the duplicate process it flagged another error that said "Failed to write in file "C:\Users\George\AppData\Roaming\Testking\Testking Q and A for PMP PMP Demo\install\PMPDEMO.msi". Error: The process cannot access the file because it is being used by another process." I tried to run it in safemode but it said the Windows Installer was not available. My machine is Windows 7. Please I already tried to reboot (a COLD reboot and waited 20 seconds). I also tried to run the machine in Selective Mode but could not make it load without "STARTUP ITEMS". I am not so experienced with computers. What do I do? Please do not post the same question more than once. I deleted the duplicate.

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