Why is Windows Explorer randomly crashing in Windows 7?

Dr. Pavithran P asks:

I have Windows 7 64 bit edition working on My Dell Inspiron. It so happens that my windows explorer keeps crashing every other day. While using the system I will get a message that Windows explorer has crashed. Can u please help me with this. First the system will freeze then the message that explorer has crashed and then it will resume on its on

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