Re-EdiTING possible

basically i just want to know if there is a program that can erase the editing off a video that has been already edited
For example i want to re-edit my youtube video but i dont have an unedited version of the video stored on my pc is there a way i could delete the editing already on the vid ?

What program did you edit it with, it might have the original in its work folder.

You can always take more out, but unless you still have the source file(s) you can’t put it back in.

I edited it with sony vegas then i uploaded it but after a week my pc chrashed and when i got it fixed everything was deleted

Damn ok Thanks For Your help though