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I just got a new computer with Windows 8, downloaded the newest Thunderbird, and it is very slow, often giving "Not responding" messages with prolonged delays

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I have a trial version of MacAfee that came with the computer. It was so slow, that I ended up REstoring my computer back to factory settings today...I reinstalled Mozilla, and it seemed OK initially, but it is already becoming very slow again.

I have a trial version of MacAfee that came with the computer. It was so slow, that I ended up REstoring my computer back to factory settings today...I reinstalled Mozilla, and it seemed OK initially, but it is already becoming very slow again.

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Either remove McAfee completely or contact their product support for assistance modifying the default settings that do not work well with Thunderbird,