Thread:Project:Support desk/erroer: Internal Error The File „C:\WINDOWS\Temp\php16DE.tmp“ dosn't exists./reply (2)

I get this error when uploaded from IE 8 on Windows Vista, but no error when uploading from Windows XP and IE 8. This doesn't seem to suggest a permissions error on the server, I don't think. Why would I have problems uploading from Windows Vista with the very same browser version?