Decode the WMA to WAV. I'm not sure how you do this in windows, you can find out with google. Then encode that WAV to MP3 with the LAME encoder, just google that, too.
Quote by Godzilla1969
I love you, Muphin. You have great taste in music.

Quote by Pacifica112J
Muphin > You

The Cooperation
go download a mp3 converter. theres lots of free ones for download online. the one i got is called Switch.
My meh gear:
Peavey Raptor Plus EXP
Digitech RP90
Digitech Bad Monkey
Electro-Harmonix Big Muff Pi (WTS)
Crate GT15 (SHIT)

Peavey 6505 112 combo
MXR 10-band EQ
Ibanez TS-9
Boss HR-2
Compressor (open to suggestions)
u can use itunes as it converts it then adds to your itunes library. be careful though. the default is set to convert to AAC (another annoyin music file like WMA). you have to go to preferences to change it to MP3. its one of the quickest and easiest WMA to MP3 conversions i know and its the only one i use. hope this helped