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2015-01-31T17:02:50+05:30

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Firstly it might have some virus which can slow down your work.
Secondly the cause may be many number of software installed.
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2015-01-31T17:18:52+05:30
A. Your processor chip is just getting old
B. Overheating
C.  You dropped a sandwich in your computer 
D.Adware/spyware is infecting your PC

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