Hi Dhiman Kakati,
I have also seen such problem in my Personal computer too but very rarely.
I am using ACER Laptop.
But after sometime when i left using trying to use optisystem software and after few times the above problem doesn’t arise.
If it continues after sometimes too, try to restart the computer and then try to use the optisystem.
hope your problem will be solved.
Regards,
Ranjeet