before messing with the browser if you have you default browser set to none in the GUI.
You could also set your default browser in the GUI (Options > Runtime) to Explorer6 DOM.
Regardless of which of those you do, you need to run the extension enabler and check only the leftmost checkbox for IE6. I recommend turning off all other extensions unless you know that you need them.
Re: Member is not defined in window for Microsoft Windows XP
You need to set the Computer Environment variable below:
QAP_NO_INHERIT_WARNINGS = 1
How To do it:
1) Open File Explorer
2) Select My Computer
3) Right click and select Properties
4) Goto Advanced Tab
5) Press Environment Variables
6) In the System variables Press New
7) Enter values below and press OK
Variable name : QAP_NO_INHERIT_WARNINGS
Variable value: 1