No, I went through the same thing. SoaSE does require Impulse and Impulse does require IE7 and IE7 does require Microsoft 2.0 framework. I don't use IE for anything and only use Firefox. Firefox does not work for Impulse. I hope that is something that can be changed. <hint, hint> I did have to update my IE just for this.
This link at Microsoft will allow you to update your IE to IE7. It is a critical update, so no Microsoft verification is needed. It just works:
http://www.microsoft.com/windows/downloads/ie/getitnow.mspx
The .net 2.0 framework will update when you install Impulse.
Hope to see you online soon!