Websites offering "YouTube Driver 4.0" are often distributing:
: Do not run any .exe or .dmg files labeled "YouTube Driver." If you are having trouble playing videos, try clearing your browser cache or updating your graphics card drivers (from NVIDIA, AMD, or Intel) rather than searching for a YouTube-specific driver.
: Designed to steal your Google account login credentials.
: Malicious files disguised as helpful utilities.
There is currently known as "YouTube Driver 4.0" released by YouTube or Google. If you are looking to download this specific file, it is highly likely a viral hoax, malware, or a misleading advertisement .