Invalid file extensions found in Norton System check/WinDoctor causing crashes?

[fluxcapacitorMB]

...& Norton WinDoctor. It continually finds these three invalid file extensions. It happens whether I OC or not, and if I even tell Norton to open the registry editor and I delete them myself. They keep coming back. And very occasionally I'll get a BSOD or IE illegal op, again w/ or w/o OC. Here's the details:

-The file extension, "klmx", refers to an invalid program indentifyer, "ECLSID\{9E56BE60-C50F-11CF-9A2C-AF3A9874}."

-The file extension, "p950", refers to an invalid program indentifyer, "ECLSID\{9E56BE60-C50F-11CF-9A2C-95A2EC74}."

-The file extension, "t100", refers to an invalid program indentifyer, "ECLSID\{9E56BE60-C50F-11CF-9A2C-AF3A9874}."