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Download and install a copy of malwarebytes (www.malwarebytes.com).
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See if they'll exchange the system for an Alienware M17x. The nVidia 8000-series chips are bad news and it will fail again once you have it replaced.
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For business use, buy a Latitude with onsite service and domestic technical support - DO NOT buy a consumer-grade Inspiron/Studio/Vostro expecting extensive support, just as you don't get Lexus-level suppot with a Chevy Cobalt.
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http://support.dell.com/support/topics/global.aspx/support/dsn/document?docid=14B3819735D6B40EE0401E0A55177ED2
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http://www.microsoft.com/communities/newsgroups/en-us/default.aspx?dg=microsoft.public.windowsupdate&tid=47d16ecf-a0a2-48c5-b7f2-11d0e9da57a4&cat=en_US_d02fc761-3f6b-402c-82f6-ba1a8875c1a7&lang=en&cr=&sloc=es-es&m=1&p=1
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No -- the hard drive needs to be replaced.