I just fixed my system at last!
Another blue screen... seems like Usb might be causing it.. and my interrupts were using 24% of the core i5 processor prior to that. I had saved a new Bios file which addresses a USB 3.0 bug for my motherboard so I just flashed the bios of my ASUS, going from version 213 to version 216. That should reduce the blue screens (I hope). While doing this I noticed that the system was slightly overclocked so I bumped the "performance" setting down one notch to normal speed.
As soon as my system came back up I went into safe mode and removed the "High Definition Audio Device" by going into Device manager (right click on my computer, click device manager... right click on the device and uninstall). Then I installed a brand new display driver from Intel which included the high definition audio. The availability display of the driver was discovered by using the Intel auto detect utility, here:
Then I restarted the system and crossed my fingers.
Amazingly, the problems with my computer which I have had for more than a year just went away. In process explorer, my CPU tlsage is 5 to 8% where it had been 50 to 90 percent! The loud fan noise is gone as well. I believe that a bad audio driver, and a USB conflict with the BIOS, combined to make my computer slow and unstable. I had assumed it was malware but it looks like that was not the issue at all!
Edited by leftlink, 20 December 2013 - 09:06 PM.