I installed Nero OEM that came with my new HP CD52 CD-RW.
I hoped it was the full blown Nero that I'm used to but it was Nero Express.
It wanted to install DirectX9 for some video app included in Nero Express.
I clicked OK.
I'm not sure if my cheapo video card supports D9X or not.
I'm guessing not.
I instaled Nero OEM (Express) in a different directory than my full blown Nero.
From that point on, Alcohol 120% wouldn't work.
Either CCD or Cool Edit Pro (I forget which) or both wouldn't work either.
I had to flash an old Ghost image of my partition to regain use of those programs.