Two possible answers(warning it may be both depending on your working kernel);
1. Create a file in the /etc/sysconfig/modules location called something like for example ndis.modules which has a line entry like; modprobe ndiswrapper
2. A possible conflict between ndiswapper and the new broadcom wireless (bcm43xx) and related modules, a quick way to check is; cat /proc/modules | grep bcm43
If you see this broadcom module then this may be the problem. You can always use this module instead of ndiswrapper if you want. You will need to install the firmware files as per;
http://fcp.homelinux.org/modules/new...17638&forum=12
Or you need to remove the bcm43xx and related modules and then load the ndiswapper module.