Pumping up the Volume?

I know this really isn't the correct forum for this, but since there is none I can see, I'm going to go with this one.

After my new build, I need to transfer all my music to my new system. Now, in doing this I've run into a little problem that didn't come as a surprise, but a problem anyhow. A few of my downloaded songs use DRM, some of these I was able to copy to the new system and Windows Media player went out to where I purchased then from and downloaded the license for them. However, some of them it would not. So, I've had to burn them to CD and then Rip them to mp3's to put them back on the new system. In doing so the volume output level has lowered when they were burned to the CD. So, of course now the mp3 volume output is lower as a result. Is their a program I can get to increase the volume output of the mp3, or to keep the volume output as high as it was from the original file when burning it to CD?

I usually try to get the mp3 when ever I can, but some of them were just not avaliable other them wma's with DRM.

Thanks
Patrick