Can you give us a LOT more info?
What email client? What version of Reader (I can only assume you even have Reader at this point)?
Please wait? I'm sure it says more than that, right?
Have you tried simply saving the PDF (it IS a PDF correct?) to your desktop and opening it from there?
Did you get this form from the IRS or did it come from somewhere else? If the IRS again, what version of Reader?
Help us help you.
I worked for TurboTax from 2003 to 2006.
I hope I can help here.
Do you know what software generated the tax form (TurboTax, TaxCut, etc.)?
What size is the PDF file (kb)? Usually a state return is no more than 120-150kb, even as a PDF.