From last few months I am using a windows 7 compatible Acer Aspire model 5551 laptop, the other specification of my system is like the intel dual core processor, along with 3gb ram, 456 gb hard drive, and NVIDIA graphics driver, the system is works fine some times. But from last few days I am facing a problem with this system, it creating a problem in few times. It not starting few times, it hangs in windows log in screen, and not proceeds further. What should be the cause of this issue? Any input will be appreciated greatly.
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