I am unable to open PDF files attached to yahoo email running in IE 7.0 on a Vista Enterprise machine. I am receiving the following error: "There was an error opening the document. There was a problem reading the document (14). I have tried to open several PDF's via email with no success. If I try to download the file, the download hangs with an error message displayed stating that Adobe could not read the document. On my home system running Windows 7, the file opens fine in yahoo. Please advise.