I wish I could say that I was sure, but I am not sure about possible infection from malware and virus.
I will say that I went ahead and went back a few days with my restore point, which did not fix the problem.
I have now upgraded to the latest BIAB and clicked on that box that allows for slower song generation and the problem appears to be fixed for the most part.
I am going to run a virus scan and malware scan at a later date when I have a little more time. For now, playback is great although the program drags a little with solos.
I am in agreement with another poster, that my old computer is going down. The wife spilled a little coffee on it a year ago, and it has been going downhill slowly with little problems.
For now, performance overall is acceptable until I get some more of that "mean green" to get a nice, new computer.