quicktime error

If i wanna play a mp3 file on the internet, it usually opens with quicktime, but a few days ago i had a pc crash, had to reinstall windows and stuff... But now everything works fine except for those mp3 files. The error is: http://www.proupload.com/uploads/1143866842.gif

I installed the file on the site they linked me to, then I installed 2 other versions of quicktime, but nothing helped, I still get the error. Help me plz <3