I too have had the same problem w/ QB Pro 2001. However I did try a respond that was posted on a QB Users site, which my son, an IT spe[censored]t got. It has do with one of QB's INI files. You merely add a minus one (-1) and the software recognizes the IE 6.0 as IE5.50.
It did work, but I was not able to use other functions of quickbooks. I am still working toward achiving full use of QBs