Winsvr.dll blue screen error

I am a PC tech for a school district running Windows NT. We have recently had a rash of Blue screen error messages which reference a missing path to Winsvr.dll and prevent boot up. We have tried replacing the file with no luck. We have also tried repairing the install also with no luck. MS suggests hacking the registry, but because this has happended to a number of PC’s, we’re reluctant to do that. Dows anyone know how to repair this error without messing with the registries? Any help would beappreciated.