thank you so much for your reply. 
1. i am not sure any back ground process is running, but if it is, how can i check about back ground check.
2. I first installed it, then i had to uninstall it, then I reinstalled on my local machine. 
3.this is my physical machine, not virtual machine.
 if you have any solution, it could be great.
Regards,
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Robiul Alam
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