I filmed video with an 8GB SxS SONY card and I was near the end of the disk space and still needed to film more so through the camera browser, I deleted some of the clips I filmed at the beginning (to get some more space back) and I accidentally deleted a very important clip.

I then continued to film until the card was completely full.

I know that there are forensic methods to restore overwritten data but I want to know if there is also software that can do this.

I have tried some recovery programs like:
Ontrack EasyRecovery Professional
Stellar Phoenix Windows Data Recovery
EASEUS Data Recovery
PC Inspector File Recovery
GetDataBack for FAT

but only 2 found something:

One found some Mp4 clips but I can't play them in any player. All players say that the file is not readable.

One found the missing file but it won't let me recover it. It has a picture of the file with a red X on it and when I choose it, the "recover" button turns gray.

Any ideas?
Thanks

There is no software capable of this.

Your data is gone.

yup. sry man but overwriten data is lost.

This is false. Doubly so on a flash card.

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You don't have to backup all of your files, just the ones you want to keep.