No Sequence preview preset file or codec after Computer reset

Hey Guys,

I hope you don't mind if I poste this in english, more people will understand it I guess.

Information:

-Adobe Premiere Pro CS6

-Graphic Drivers all Up to Date

-Sing out and Sign in didn't helped

-Deleting Chache and other things diden't helped

The Problem:

I have to finish a project together with a friend. We worked on his Computer but his Harddrive got corrupted or something like that, result. Reset of the Whole Computer. I managed to get every Videofile and every ProjectFile back that I knew off. right now i can literally see at what was on the harddrive before, but the Project has a Problem:

"This Project contained a sequence that could not be opened. No sequence preview preset file or codec could be associated with this sequence type."

I coulden't find help anywhere, I'm looking for a solution since a week now. Am I missing a File that was saved in the Temporary Folder? What am I searching for, what file type? Can anyone please help, that is the work of months and it has to be finshed this semester.

My hope- and thankfull Greetings to all of you

Adrian