Full game view (notice the lag-o-meter on the right)
YouTube - lag

Lag-o-meter fullscreened
YouTube - ET 2009-01-06 19-03-36-53aq

its basically a hiccup every 7 or 8 seconds

Things I've tried/noticed:

RTCW SP works fine

Other people on my network playing ET do not have the same problem

It happens on all servers (including non-pb servers)

I've tried several wireless cards.

tried deactivating DMZ

tried disabling all port forwards.

tried anti-virus/anti-spyware scan (AVG and Spybot S&D)

tried formatting my whole hard drive

Still no luck...

I moved my PC to the basement where the router is, and am still having the problem. I attached an ethernet cable to the onboard ethernet and router and can't seem to be able to make the wireless connection stop. Suggestions?

Also, does anybody know any free/trail software that has an active streaming latency test like the one built into the game engine?

Router: Linksys WRT54G
Manufacturer: Dell Inc.
Processor: Intel(R) Pentium(R) D CPU 2.80GHz (2 CPUs)
Memory: 1024MB RAM
Hard Drive: 244 GB
Video Card: ATI Radeon HD 3450
Monitor: 19" Flatpanel LCD
Sound Card: SB Live! 24-bit
Speakers/Headphones: Logitec Headset
Keyboard: Razer Lycosa
Mouse: Razer Deathadder
Operating System: Windows XP Pro (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_qfe.070227-2300)

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Other people on my network playing ET do not have the same problem

I've tried several wireless cards.

This auto suggests that you have a computer issue and not server/router or wireless issue.

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tried anti-virus/anti-spyware scan (AVG and Spybot S&D)
While this is a start I would suggest that you try some other applications as well to make sure that your system is absolutely clean from malware/spyware.

all free to use:

SUPERAntiSpyware.com - Downloads ......( self explainatory)

BillP Studio: WinPatrol Download ........use this to remove any start-up programs and auto updaters that are running on your system. It will allow you to disable/enable them as needed.

Ccleaner..... |MG| CCleaner Slim (No Toolbar) 2.15.815 .....use this to clean out all your temp files and caches for hidden url's that might be causing problems....then use the registry cleaner and run it to clean your registry for any dead or hidden pathes....run it twice through or till there are no more issues found.... It allows for back-ups but I have found this safe to use and fix all issues found without worry.

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I moved my PC to the basement where the router is, and am still having the problem. I attached an ethernet cable to the onboard ethernet and router and can't seem to be able to make the wireless connection stop. Suggestions?

Use the device manager to disable the wireless network adapter...you can re-enable it at any time.

Use windows Icon key and the pause/break key at the same time to bring up windows property box > select hardware tab > select device manager button > select network adapter and double click on the wireless adapter >
select to disable this device and press OK and exit!