I am unable to do a system restore because I do not have a restore point back to before the problem is known to have begun. You may not agree with it, but I do not enable system restore, and as such it is not something I can resort to. The suggestions you guys are making are beginning to get a bit unreasonable, I have stated my facts and observances, I am not here to "trick" anyone... I have a legitimate problem I am trying to resolve. Many of the things you both have suggested I have already accounted for, and several things can already be ruled out...
The computer I am using is self-built, if you must know the hardware details then I can present them, otherwise I don't believe they are relevant to this problem at all. The ethernet card is integrated on the motherboard as I have stated in a previous post. I have updated to current drivers, which had no effect on the problem. Could you please suggest one of the "large number of things" I have failed to do already, I really am open to trying legitimate possible solutions... Reinstalling the OS is out of the question, and is not a reasonable solution to a problem. At this point I am going to continue working with the server administrator to determine if that is a possibility or not.
Windows 7 does not include IP filtering options in TCP/IP settings anymore, I believe they are now a function of windows firewall.
Site loading on my wife's Kindle connected via wifi to same router as main computer, screen in background is main computer in question on the exact same network: