Bit of an oddity this one in that you say your computer may not be working correctly, yet specify that the remaining problem is with syncronizing between an MP3 Player and WMP10.
To begin with I suspect that if you ran the reload through your suppliers help line they would advise you on the best way to get your computer up and running correctly, so in essence your computer is working just fine and the current problem may not be Hardware related at all, just a simple software problem or an incompatibility between your MP3 and WMP in that the file has a quality level that the MP3 does not support, along with a host of other causes from protected content to licence issues, other than this unless you can be a little more specific on the fault and any messages it throws up little can be achieved here.