Get everything back on OSX I really need your help.
I've tried to improve my graphic card with the help of this Video https://www.youtube.com/watch?v=l5EKzHq4pAk&amp;t=117s 


  cd /S*/L*/Ext*/AppleIntelSNBGraphicsFB.kext/C*/M*
  sudo cp AppleIntelSNBGraphicsFB AppleIntelSNBGraphicsFB.backup
  sudo perl -pi -e 's|\xC7\x45\xBC\x00\x00\x00\x20|\xc7\x45\xBC\x00\x00\x00\x40|g' AppleIntelSNBGraphicsFB
  sudo touch /S*/L*/Extensions


But after this, my mac doesn't see my HD3000
How can i get everything back using kernel?
Boot into recovery mode and reinstall OS X on top of your existing installation. This shouldn't delete your data (but you have that on backups anyway, right?), just repair your OS.

If you also downloaded some random software from obscure russian servers as suggested in the link you posted and gave that software admin access to your computer, you might want to wipe your system and do a fresh install. It could easily have installed malware.

And maybe don't patch your kernel with instructions from YouTube without knowing exactly what you're doing in future? (And questions like this go on http://apple.stackexchange.com/ as it's not programming-related but just general how to use a Mac stuff.)