WMP changing track data on playback

I have two problems with WMP, I hope someone can come up
with what is causing them.
(1)WMP opens a data disc containing .mp3 files OK.
Initially (for all of two or three seconds) it will
identify the track titles and artist, then it changes all
of them to "audio track 1", "audio track 2" etc. Other
players do not seem to do this.
(2) Playing these tracks I encounter 1 sec pauses every
now and again, never in the same spot, seems to be the
same with audio CD's. Running P4 1.8 Ghz with 1GB RAM.
Watching system resouce meter I am seeing spikes while
playing music.