I wish that I would have seen this post sooner. I just experienced the same problem. After 3 days for trying every fix, I called Intuit and was quickly asked if I had McAffee. Then they wanted to try all the fixes that I already tried. Apparently, they do not want to come right out and tell you to delete McAffee. Question is, did you get any response from McAffee?
Were you able to cancel service without much hassle?