Stay away from it. I can't find any info about player_mp3.exe...the closest thing i could find is play_mp3.exe, which is malware.
PLAY_MP3[1]..EXE, Spyware Remove


Just to be on the safe side, update your AV & scan your computer. If you don't have an AV, try one of these free ones.
avast!

AVG free

Avira Antivir

I'd also scan for spyware & adware. These are free.
Spybot S & D

AVG Antispyware (formerly Ewido)

Ad-Aware SE Personal

Ad-Aware 2007 Free

Make sure to keep your AV updated & scan all downloaded files before you open them.