how can you change .mp3 files to wma files?

You will simply have to download a file converter. I went to www.download.com and they let you try out different programs for free. Type in the search box file converter and they will show u a lot of different file converters you can try out. You can use those file converters to convert mp3 files to wma files.

Learn to use the available search engines.....

When I type "convert mp3 to wma" into Yahoo search, I get over 3 million "hits" returned. If that isn't enough for you, Google returns 9 million.

There are many "free to download" products out there. Most are pretty good or better.....

actually you can. you just need to find a good converter in the market. however I would not recommend this as .mp3 files are much more accepted by many more programs than wma format. but if you still want to do it here is a link to a program you may want to use http://www.download.com/Free-Mp3-Wma-Converter/300...

i dont think you can unless you copy them 2 a cd and then put them back on your computer if that doesn't work go to google if that doesn't work you are screwed