Wired - SLOW / Wireless - FAST (WRT54G v.6 issue)

Hello,
We have a WRT54G v.6 wireless router and Verizon DSL with Windows XP. Four computers total make use of this router to access Internet. All computers are very new and in great condition.
3 computers connect to Internet wirelessly (laptop #1, laptop #2, desktop #1).
1 computer connects to Internet via a wired connection with the router (desktop #2).
When download speed tested on http://infospeed.verizon.net, desktop #2 download speed is significantly slower than all three wireless connections (300 Kbps instead of 1.5 Mbps).
When wireless connection is disabled on laptop #1 and wired connection between router and laptop #1 established, download speed still tests to 1.5 Mbps rather than 300 Kbps. To me, this demonstrates that our DSL service and router are working as they should.
I decided to reinstall/upgrade the router's firmware, just in case.
I tested a couple different ethernet cables, just in case.
I dusted all my ports with a can of compressed air.
I tried using each of the four different ethernet ports on the router.
I disabled and then enabled Windows firewall, just in case.
I then updated the drivers for the "Intel Pro/100 M Network Adapter" (ethernet card) on desktop #2.
Problem seems to be related to desktop #2 's Intel Pro/100 M Ethernet card—either its settings or hardware—or to the interaction between router and Ethernet card. After all, when a wired connection between the router and a different computer is established, the internet speed is ideally fast. Plus, all wireless connections are equally ideally fast. It's just when I try to make a wired connection to this one computer, desktop #2, that I get a less than ideal result.
Any hints about how to bump the Internet speed of desktop #2 up to 1.5 Mpbs like all of our other computers would be appreciated. =)
Message Edited by SirNim on 12-30-200606:50 PM

well...as the wired connection works fine with the laptop , the problem can be isolated to the desktop....the mtu settings on the router is not a probelm as well....the only solution i can think at this moment is downloading TCP optimizer adn run it.....this will adjust the mtu settings on the NIC card....you can give this a try...to download it , click here ...

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The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc. The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
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