My computer seems to be having an issue with tier0.dll

Recently I got the model decompiler, and when I try to open it, It gives me a message about tier0.dll being an invalid windows image. Could someon please explain the problem, and if possible, give me a solution?

Hmmmmm. What Model decompiler are you using.

Cannonfodder’s.

Tried XSI?

XSI can decompile?