I began experiencing this problem yesterday. I use Debut, not the SoundTap program itself. I was having an audio problem with Debut, and I was sent a different version which apparently requires the STDRIVER64.sys. In the 2 hours I using my video editing software, I had 4 BSOD's. I caught the driver name before it automatically restarted.
SoundTap is not listed in my Programs and Features, nor is it in my Start list.
I also searched the Registry for NCH, Sound Tap (and SoundTap) and even STDRIVER64. The only item which came up was a Registration entry for Debut.