For future reference, when you have to get rid of malware, i would highly suggest moving the file to a contained folder (where the malware using it can't access it) instead of deleting it altogether. In this case, it probably wasn't necessary, but still useful suggestion for future needs.
After Googling ndis.sys, the file turns out to be a wrapper driver, so it's basically just translating your driver to your OS (wrapper drivers/driver wrappers are needed when the driver used is not meant for the OS being used in). So, as U-235 suggested, reinstalling should fix the problem. Completely uninstall the device, and then let Windows find it on reboot. Install using generic or manufacturer drivers, if possible.
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