Gknot problem?

Hello to all. I have a small problem with Gknot and I hope you can help me out.Ok,as I start the Divx5 compressibility check for my rip I get a VirtualDub error.That reads. Avisynth open failure:Loadplugin:Unable to load''mpeg2dec.dll'' After that error it fails to perform the compressibility check.I have check all the ''Program paths'' and everything looks good.Do you think I might need a new version of Gknot?I'am not sure what else to do.Thanks for all your time. Have a super day.:(

Thank you Iradic! 

Thanks for the help iradic.I feel like a idiot!Under the options tab,no I did not have it checked.Everthing is back to normal.Thanks again for all your help and time.:)