How do I view the articles?

New to TR. Looks very promising except that I’m unable to view the articles?? Most appear to be pdf and I have that installed. I click on the link, log in, next screen reveals the title of the article along with a bunch of others…but…no article. Is there a setting of some type I should enable? Running MS 2k Server and Firefox. When I switch to IE, I get the following error when the next page shows: “Duplicate entry ‘15553655’ for key 1” Any assistance appreciated.