WMA songs will only convert on the Windows version of iTunes. And even then, only unprotected WMAs will work.
AFAIK, iTunes will not convert WMVs, protected or otherwise.
Just use Handbrake and convert the DVD. If it's a newer DVD that chokes Handbrake, you can use MacTheRipper to rip the DVD and then Handbrake to convert. If you're on a PC, DVDFabDecrpyter is free and would be used instead of MTR. Then use Handbrake to convert to h264 or mpeg-4.
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