Packet Loss, only on one PC

Recently (6 months or so), I started hosting WC3 games a lot to play dota. I found a few programs that reduce the delay players experience in your games. When I started using those, players in my games started complaining about spiking lag. I posted on a few forums, and I was referred to this website: http://myvoipspeed.visualware.com/ . . . I ran some tests and most results turned out like this:

I tested it through my laptop using the same ethernet cord to the same router and experienced no packet loss at all. I also tested my desktop with a wireless card and experienced the same packet loss (while my laptop had no packet loss over the wireless). The people at the other forum concluded that the only thing it could be is a NIC problem (I used onboard). Well, recently I upgraded my NIC card and I am having the exact same problem. A friend told me I should post on this site to hopefully get help with my problem.

I don't know if this is the right forum for this because I don't think it's a network problem, but I dont know a better one (the NIC forum is too specific considering it might be something else hardware related).

Also, I had to get a new hard drive at one point and started out with a fresh install of windows with nothing else on it. I didn't experience and packet loss for a month or so, then it came back to the same .1% to .3%. Oh, and when the connection is "fresh" like right after I reset the modem or right when I installed my new NIC, I was able to experience no packet loss for like 10 mins or so before it came back to the .1% to .3%. One more thing: I moved a few months after this started for college.. got a new ISP with a diff router and stuff, still have exactly the same problem as before.

Hopefully someone can point me in the right direction, this problem has caused me a lot of frustration.

No lag at all on my laptop. Also, the .1% isn't detrimental at all to regular browsing or any other games, but it's just a problem with my computer that I would like to figure out.

I've messed with that a lot over the past week. Most of the time I have no packet loss at all, over 500 pings. But, the lag is still there in game. Is there any hardware besides the NIC that could cause packet loss?