I run a home network with a Zyxel 660R to a NetGear 8-port Gigabit Switch to 2 wired Macs, a wireless access point and 1 wired PC running Windows XP. Embarq is my DSL provider.
My renter runs the PC and is unable to connect to the eHarmony web site. It does not load.  I can access eHarmony from all of the Macs on the Apple software, but they will not connect using Windows XP in Parallels on the Macs.
Further more, the PC has been removed to a different cable modem network and it accesses eHarmony.com fine - so we know it is not the PC.
Embarq support acknowledges the problem, but states they have no solution at this time. 
Any solutions or suggestions?  This is the only website we have ever run into this problem.  I suggested my renter just stay single.

Computers & Internet - Zyxel - Prestige 660R Router (91004397002)