I've found that using rc.wireless.conf with Slackware doesn't always work with ndiswrapper. Instead of using that, try adding the appropriate commands to your /etc/rc.d/rc.local file and see if it works any better.
If you have the choice of WPA or WEP, WPA is definitely the way to go, but it does complicate matters in that you need to use wpa_supplicant in addition to ndiswrapper.
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