Ok so I have seen this a lot around the web, users seem to keep running up against it and there don't appear to be many things which work to solve it. Interestingly, on this forum none of the recent queries about the problem have been even answered. I was having the problem today. One thing I noticed was: I had Kaspersky Antivirus free installed and when I browsed to paypal.com it complained about an invalid certificate and when I chose to ignore the warning and go to the site anyway I got into the endless loop with "too many redirects". I was not even able to create an account on the forum here because to do so I was being redirected to the PayPal site and so got into the endless loop again. So, as a last resort I uninstalled Kaspersky Antivirus Free and Voila! here I am with no more redirect errors and I'm able to log in to Paypal.com. So the solution for me was to uninstall Kaspersky. And incidentally when I look at the certificate details for the paypal.com site they look fine.
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