ndiswrapper isn't exactly built around kernel standards since its such a goof. It might work to put the command line arguments in /etc/modules.conf, something like:
alias eth1 ndiswrapper
options blah blah blah blah (all the arguments to the ndiswrapper load)
OR...
Just cheat. All the commands you normally use to force load ndiswrapper, just can be put in /etc/rc.d/init.d/rc.local
Or really, post back your distro and I'll tell you which file it is that is the rc.local-alike, Debian, Mandrake, SuSe, Fedora, Gentoo, and Slackware all put them in different places. Its really important to fill in that Distro spot on your profile
Cheers,
Finegan