You didn't reveal a very much needed detail so the first problem is what email app is this.
If it's one of the usual, you should try it without the comcast supplied add on.
Bob
When I try to open my first email, I get a box with the label
*******************************************************************
"CRITICAL"
An error occurred while initializing the zimlet
"Comcast_search"
Please notify administrator.
**************************************************************************
At th bottom is a box to send an error --a click on this seems to do nothing
Another box say to give details---a click on this gives a blank box with the same above message
Another box says OK--clicking on this deletes the box and clears the screen so that I'm looking at my email and everything seems to be okay, until I open my email the next time. BTW, there is no administrator
Thank you

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