Problem ... please help

When I go into the my music files and click on one of the links a little Windows Media Player preview player comes up on the right side. Some of the songs I can press play and it'll work, but there are others that do this:

wmprph.exe Pid e20 Tid 1148. Module Quicktimesource.dll, 2 objects left active! At line 317 of D:\Program files\Dxsdkg\Sample\C++\Direct Show\Base Classes\dllentry.cpp
(cancel to debug)

Can someone tell me why that's happening? I downloaded the song from a CD so there shouldn't be any bugs in it.

Thank you,
Avalon