Two questions that I need help on!

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I'm using Windows vista and every time I want to attach a document a popup

appears say Extension CLSID verification host has stopped working and will

close the program.

 

Question #2

Many times after I am done working on a word or powerpoint document and

close the program- A popup appears that says program as stopped working and

windows is checking the problem.

 

How can I get these to stop happening?

Thanks!!!