That is all very good, but what is the error message?

In my e-mail, whenever I click on the message - Mozzilla Thunderbird Not Responding comes up, the screen fades out, after more than a minute the screen comes back and sometimes the message comes. This is very frustrating. Since hooking up with Mozilla in Jan. I have been having this problem. Need some help. I also have a Hotmail address and no problems there.

What anti virus are you using?

Ohh,, and delete the MSF files for the folder while Thunderbird is closed. That will ensure a new index is built. Just in case the repair did not do it's job for some reason.