Are you sure you deleted nvcpl.dll AFTER running win7_fix.bat? Do other save files load normally?
If you're absolutely sure everything is installed correctly, I'd try loading the game a few times more (sometimes Borderlands fails to fully load custom content on first try), or, if all else fails, re-installing the game along with the mod.
Also, do you get any error message when the game crashes? If yes, you could screenshot it and post it here. Maybe that'll help figure out what's wrong.