Help I erased stock 2.3.4 nandroid backup

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I accidently erased my 2.3.4 backup. If I download it with the stock rom option in clockwork will I have to root it again. Also in the review's it says to "be carefull it includes the bootloader. What does that mean . Any help would be great.

 

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Nevermind I just read the sticky post at the top of the page (duh). But I would still like to know about that stock bootloader in the clockworkmod download rom option. Does that mean I will need to reinstall clockwork after I flash that rom.