Non-authoritative answer:
Name:
www.paypal.com
Addresses: 216.113.188.64, 216.113.188.65, 216.113.188.66, 64.4.241.33
64.4.241.34, 216.113.188.33, 216.113.188.34, 216.113.188.35
Above are addresses for
www.paypal.com. Check that nothing has 'corrupted' your hosts file to point to a 'phishing' site.