My internet connection no longer works

I'm a newbie as regards MACs. I have a MBP and it has been working OK on the internet. I have a Netgear DG814 router and a LAN connected with my PCs. Internet is OK on the PCs (I'm using one for this post).
It was OK on the MBP until I tried to set up WEP on the airport. It worked but, like everyone it appears, my connection kept dropping off.
So I went back to a wired connection. This used to work but now it doesn't. I can see all the PCs on the LAN from the MPB. I can see the MacBook from the PCs. I can connect to the router as administrator, from the MPB. It doesn't appear to be a DNS problem as I can connect to Apple by browsing to http://17.254.0.91 from Safari.
However, the page takes about an hour, or more, (this is not an overstatement) to be painted. It takes a matter of a couple of seconds to do the same thing from the PC!
I'm using fixed IP addresses on the LAN.
I used to know my way around Unix once upon a time, but that was 15 years ago! It's amazing how much you can forget in that length of time.
Help . . . . what do I do ????
Macbook Pro Mac OS X (10.4.8)

Hey Bob - check to see if UPnP is enabled in your router, and if so disable it.
I've now solved a half a dozen local 'erratic wireless' problems on MacBookPro's by disabling UPnP in our routers (all of them Linksys, for what it's worth). It may be that our problems are not your problems, but it's worth a shot.
[Other details: using a Core Duo MBP 1.83 in 10.4.8 via 802.11g, along with a bunch of other wired and wireless Macs, PCs, a Linux machine or two, and my Nokia 770; all auth via WPA2; WRT54GS v 2.2 firmware at 4.71.1; in each case, it appears the MBP's interaction with the router's UPnP was preventing regular communication with other devices on the network.]
Another suggestion: there is a MacOSX build of Ethereal floating around somewhere - it may be worth finding it, running it on your MBP to see what packets are hitting the interface. Given your explanation about extremely slow rendering, perhaps you have something on your network that's impairing throughput. In the same vein, you might google MenuMeters and install it for a constant display of throughput as it relates to you MBP (be sure to go into the settings for MenuMeters to enable each of the options it presents).
MacBook Pro CD 1.83 Mac OS X (10.4.8)

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