slow wired connection on 2nd PC

First time post, I did search.

I am having this problem with a second computer on the router, here's my set up:

2 computers (wired):
PC-A with the router 4ft away on port 2
PC-B with router 50ft on port 1

VoIP on port 3
extra PC on port 4 (hardly used)

I have a Linksys WRT54GL with latest f/w

Not sure what the issue is with PC-A, even when I had it 4ft away from the router it was still slow. Girlfriend says computer slow so would use mine, but not computer PC-A is AMD X2 6000 (3.0ghz), PC-B is AMD X2 DC 4000 (2.3ghz), I built them both.

PC-A has the primary IP 192..100, with PC-B on 192..124, I also use some torrents but usually have those off when not needed.

I was checking speedtest.net and it is still going on the upload speed, started at 512kb and now down to below 10kb and still going, download is at 5800kb.

What could be wrong, or do you need more info?

Thanks