my USB key doesn't work...

hi! i just bought a Sandisk 16GB and I can’t transfer my powerpoint on it from my computer (Dell with windows vista). It says “element not founded It doesn’t exist in *********, please try again” … I can’t even open the others things in my USB key…

i really really need your help!!!

What are you using to access your files?  PowerPoint or Windows Explorer?   Windows Explorer is the only app that shows what’s on a drive.  The others show what they last accessed, which may have been on a different USB key.