MeGui AviSynth script creator error

Hello,
I have been recently started using MeGui on windows vista 32 bit, and I am experiencing some issues.
I recently tried to open a video file using AviSynth script creator, but I got an error.
The screenshot of the error is as follows:

The message states:
Cannot open video input
The filedirectshowsource (“C:filesmoviesthemadagscar penguins in a Christmas caper.avi”, audio=false) cannot be opened. Please make sure it’s a valid Avisynth script and that Avisynth is properly installed.
To sort out the issue, I updated MeGui to 1041 and I also tried MeGui 1020, but twice I was met with the same error. Then I also reinstalled avisynth but in vain.
Can anyone please guide me how to remove the error and play the video successfully?
I'll be really grateful.
Thanks.
