Very Slow lan speed at WRT54G v8

Hello folks,
I'm very sorry to bring this issue to you, but I've checked all the information avaliable at the forum and was not able to solve my problem. Here it is:
I have in my house total of 4 devices:
2- PC (P4 2.0 Gh 1 gb RAM) running Windows XP SP2 (hereby Pc 1 & Pc 2)
1- Notebooks (Core 2 Duo) running Windows vista (hereby Note 1 / 2 & 3)
1- Playstation 3 (hereby PS3)
Before I buying my Linksys router I used an Thomson Speedtouch Modem as router, and all conections were wired. I had no problem at all. Upnp at this modem worked very fine, and wired transfer files on my network worked very fine (transferences at 9 mega bytes per seccond)
Now, I've changed my router to wireless WRT54G v8.
PC 1 & PC 2 are using cables
Note 1 and PS3 are using wireless conection
The internet conection works very fine. I have an assymetric internet (very commom in brazil) and I get 400 kbytes per seccond downloads, which mets my desire (speed is ok)
But I'm having a hard time with the wired conections...
I'm using PC2 as a download center. So, I download everything using this PC 2 and then share through the other computers on my network.
But, if I try to download things FROM PC 2 to PC 1 I get about 30 kbytes per seccond speed (previously it was 9 megabytes per seccond)
If I try to download things FROM PC 1 to PC 2 I get 9 megabytes per seccond speed (which is fine)
If I try do download things from PC 2 to Notebook 1 I get 1 megabyte per seccond speed
If I try to download things from PC 1 to Notebook 1 I get 3 megabyte per seccond speed
Since I havent changed the cables from the previous instalation, the only responsible for the problem, as far as I can see, is the WRT54G router.
Things I've tryed so far
- Configuring firewall for correct IP authorization
- Changing MTU to 1400
- Changing the network card speed to 100 mbs full duplex on both computers
But the problem did not go away.
I would be very happy if any of you could provide me ideas to solve my problem.
Thanksa lot!

Sorry to bump this article, but my problem is not solved...
I've tryed several things, but the problem cannot be solved...
One thing I could figure out is that I cannot ping the PC which sends files very slowly.
This could indicate that the problem is firewall related, but, checking Norton configs, it seems that everything is OK. Even if I desable completely, the problem still occour... Windows firewall is also desabled...
I'm considering the idea of removing Norton firewall completely, because I think is related to it.
Any thoughts??
I've also tryed:
changing network cable
changing network card
and the problem still occour...
Help??

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on 28-10-2012 12h38
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