how to insert characters in front of a filenames in a directory in windows

I have bunch of file names in a directory.  eg.
.. and so on.
I want to rename these files so that all start with HH_
how can I do this  in windows?  in dos mode?
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NVITEnd-user supportCommented:
In a CMD window...
for %a in (*.xml) do ren "%a" "HH_%a"

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Joe Winograd, Fellow&MVEDeveloperCommented:
Bulk Rename Utility is a free utility that can do what you want:

Even better is Flash Renamer, but it's not free (although it has a free trial):

Regards, Joe
ALad2005Author Commented:
thank you experts ! for your help.
Joe Winograd, Fellow&MVEDeveloperCommented:
You're welcome — happy to help!
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Windows 7

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