|See this post for starters:|
Can you give a little background? Was it working and then suddely stopped?
It is almost unheard of for a file to suddenly delete itself - did you do something? Are you getting an error message asking for this file?
It is not on my Win 7. Sometimes error messages like this are the remnants of a virus (and you don't need the file at all).
Always pop back and let us know the outcome - thanks