I don't know exactly what I did, but somehow the sfsync04.sys (drivers) file is corrupt, and now I can't start my windows. That's the error startup repair gives me, and it is unable to correct it automatically. I'm currently running a live version of Ubuntu, so I can access my files, and everything seems to be alright except for the sfsync04.sys file.
Is there a way I can repair that file so I can avoid reinstalling Windows for now?
I'm running windows 7 64 bits. The file is in windows\system32\drivers\ . I think this happened when I tried to install some legacy software, but I'm not sure.