Avant browser won't run in Sandboxie 2.80 for me... help?

I have Avant set as the default browser on the system. I have the latest Avant and IE 7. I renamed Avant as "iexplore" and made the menu link's target: ""C:\Program Files\Avant Browser\iexplore.exe" This is described at the Avant website:

" Does Avant support the new features of the Windows XP SP2 security update?
Yes & no. Out of the box, Avant does not recognize the SP2 update features. However there are two methods to get around this:
1. Rename the Avant Browser executable in the Avant Browser program directory from avant.exe to iexplore.exe Or... "

Anyway, I can open Internet explorer 7 but Avant opens with a crash error report from windows. Then Dr. Watson crash reporter crashes.

Any ideas?

B.