The vsync option is in geforce control panel ( not geforce experience ) under 3d settings or something , select game in the list and the option should be there.
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Here is a screenshot of @Funks method in English (If this helps in anyway)
Step - 1
Step - 2
Hope one of the two methods work for you, I've never had to change any of the 3D settings although it seems others have had to, either way good luck
This did the trick thanks to you all
I'm not certain as of what you mean by your stats were
reset, although if your Multiplayer stats were reset you can simply use
this tool to become Level 55 and have everything unlocked.
Easy Account 1.7.zip - Zippyshare.com - Easy Account 1.7.zip
I mean when I launched CoD4 I got a message saying: "An error occurred while reading the stats data. Your stats have been reset."
And I think it reset everything for all mods. But I haven't done much testing yet. I'll surely find a solution by googling a bit more. Or maybe HawK's solution will work.
Edit: Fixed. I just had to remove the corrupt mpdata and put my not corrupt backup file in the folder. The first time, the stats were reset because I had not yet written my CD-key in the options.
Thanks for everything