I want to get all my mp3 files to the same bitrate (preferably 128) and was wondering if there was a program that wud do his automatically, currently i use Audacity but that requires manual opening of every mp3 file..

Any ideas if such a program exists?

http://www.dbpoweramp.com/dmc.htm take a look at this site that may help you

Just as a tip: Don't convert MP3's with a lower bitrate to a higher bitrate. That won't improve anything and the only thing it can cause is lower quality and bigger files.

If you want to convert MP3's with a high bitrate to something lower in order to make smaller files i'll suggest you use 192Kbps instead of 128. Many people can still hear the diffrence between 128 and 192. But most average people won't be able to tell the diffrence in quality between 192 and any higher. I'm not saying you should, just a little tip.