you describe could be caused by several things. Bad power management or failing power supply. The CPU isn't powerful enough to the jobs you are running together. Not enough memory to support the tasks you are running. The CD player itself might be at fault.
Please provide us with more information. Use the red print above to guide you.
Whenever I play music on my computer, it is getting off beat. It seems some seconds last longer than others. Looking at the start menu's clock, also makes it look like seconds are inconsistent.
This makes the music slow down and speed up accordingly. It makes a kind of clicking and growling sound and gives the music an effect similar to the one you can get on Windows media player when you change the speed. It does this while playing from CDs or the hard drive. It dosen't always do this - but usually.
I have a Dell Dimension 2400 and I run Windows XP Home edition.