How it is being?

I am using windows 7 ultimate trial version. Now I am not being able to click an open on the icons like "Computer", documents containing icon, "recycle bin", "network", a small window appears showing " Windows has stopped working". And there is a tab of 'cancel', and after clicking cancel, another small windows appears which contains a message - "windows explorer is restarting.".
i became so much irritated by this problem. Please kindly help me for this problem. Thanks in advance.

Sushil Kafle
Kathmandu, Nepal

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