I'm going nuts :eek: and am hoping someone might be able to pinpoint my problem for me.

My browsers won't let me look at or download PDFs. I'm thinking I must have some security setting ticked that is the problem. On Mozilla I get a blank white screen that says "This object has been blocked" and IE gives me a page that says "You are not authorized to view this page. You might not have permission to view this directory or page using the credentials you supplied." This happens for every link that is a PDF.

I know it's not my Zone Alarm because I've tried accessing the links with it off.

Any help would be greatly appreciated, thanks.

It sounds like you have a problem with certificates. To check it: open Adobe, then select >edit, >preferences >digital signatures. Uncheck the box that says verify digital signatures.
Your version of Adobe may be different, so you may have to look for the right way to turn off signature checking.