VBA to list files not appearing in column

Hi All,
Hope this makes sense..
I have a spreadsheet i use for my Movie & TV Shows Listing.
I have the following..
Sheet: MOVIES LIST
Column C: FileName
Column D: FileExt

I have the following code that checks for the Filename&FileExt to advise if they exist (this checks my spelling etc are same as file name on NAS).
This works perfectly as i want it.

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I am after a way to display a list of Files that exist within the MOVIES folder on my NAS that are not listed in my Column C&D.

I have tried the following which works but i then have to put

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into the column next to it to show TRUE or FALSE.
I am just after it to display within a particular Sheet extra files which are nor listed in my MOVIES LIST sheet.

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Thanks Patel45...
It works great and has picked up some files which do not exist in my Movies List.
However it also picked up some files which do exist.
I have looked at the spellings and Cell Formats (which all are set to Text) and can't find any difference..
Out of 1200 files your script found 10 files which it thought did not exist in my list.
However only 2 of these are files which did not exist.
Not sure why though..

Any ideas?