I'm pretty sure I know what the issue is now. The same thing happens (or used to) with GPU-z. I have seen a few other people report the same thing with both gpu-z and hwinfo.
Here is what Wizzard found to be the reason.
For some reason my pc locks up occasionally when launching HWinfo64. It always seems to happen when it says "scanning ide/scsi devices". I'm at a loss on what could cause that to happen.
For some reason my debug and report file seem to be too large to upload here. So here they are on...