npswf32.dll is associated with the Shockwave Flash 5.0 r41 and the program Shockwave Flash, it was developed by Macromedia, Inc. npswf32.dll errors are most commonly caused when two programs share the same .dll file. When a program is deleted sometimes it will delete the .dll file associated with both programs. Errors can also occur from a faulty npswf32.dll file or incorrect versions of the file.