The best and safest bet is not to install those programs yourself but it use the Wrye Python 04 package (found on the Bash Nexus page).
The next thing to consider is Operating System and install location. Bash is not UAC friendly. It is recommended not to use the default location (C:\Games\Oblivion for instance is better).
I just had to do the log myself and it is a pain to get right (the instructions are not so clear for computer users):
So to generate the log you have to open a command shell, navigate to where bash is the enter the bit above:
c:\python26\python.exe bash.py -d
After spending a bit of time with Morrowind modders - I think this could be made into a bat file I'm pretty sure.
However - my bet is that Wrye python and correct install location will solve it for you.
Ohh and I thought this was the other interiors thread you started - sorry Immersive interiors fans - I didn't mean to contribute to the problem.