Recently I reformatted my computer and upgraded to windows 7. Everything is working really well, up to today, where I need to open a PDF file.
In FireFox I get this error
Firefox could not install the file at
because: Not a valid install package
In Internet Explorer I get a unknown publisher error.
I'm using Windows 7 Home Premium; 64-Bit
If you need more information I can provide.
Thanks in advance,
Have you tried installing Reader X?
207 errors in Firefox indicate that the XPI file is corrupted. An XPI file is a special type of ZIP file containing the add-on and instructions for Firefox about how to install it. In this case it's the get++ add-on which is triggered when Firefox is asked to open a PDF file but there's no system application registered for that tile type - Firefox asks the database for a suitable plugin, is told that Adobe Reader is the one to get, and get++ is the download manager which Adobe uses to deliver browser plugins above a certain size.
Assuming you're using the 32-bit version of Firefox (we don't have 64-bit support yet), the XPI package is OK on the server, but can sometimes be mangled by firewall software. You don't need to use it, as installing Adobe Reader "manually" from the Adobe website will add the browser plugins too.
Simply visit http://get.adobe.com/reader/ and click the button.