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Windows 7: Windows 7 breaking WLAN

09 Aug 2011   #1

windows 7 Home x64
Windows 7 breaking WLAN

Some background: I have 7 machines at home all connected to a wireless router. Up to yesterday everything was going smooth (as it should).

What happened: I just bought a new PC, and the first thing i did was a fresh, clean install of windows7. The problem is that as soon as i turn its wireless card on, the WLAN drastically drops.

I am sure it is not a configuration problem on the card: i checked and rechecked (a while ago i had a similar problem when i made a wireless card of another computer work as access point - so i even checked that possibility) but nothing was out of place.

The thing is that my WLAN speed is around 30~40MB in and as soon as i turn on that particular wireless card it drops below the 500k mark. I turned it off and it goes to 30~40 again.

I am no computer newbie, and i spent more than 4 hours last night goingh through EVERYTHING i could remember, but i just can't seem to find a solution.
I tried everything i could remember in order to solve the problem (checking and re-checking IP adress clashes, install different drivers were the first things i did but to no avail. I even made package testing on the WLAN traffic - maybe some process was making some weird DOS on the router - but it as also a no go: no packages were even being transmitted/received by that card. I googled it, turned off ipv6, turned off tcp autotunning, NOTHING worked). Maybe it was a "strange" background process screwing up the network: I killed-tested every process. Still nothing.
Oh, also, my network card was the one i had in the old PC. I just transferred it to the new one, so it can't be that: I tested the card in every other PC and there was nothing wrong. Only that particular computer/installation caused the problem, so I am pretty sure it is some sort of bad configuration of any sort , but I ran out of ideas. I need your desperate help

Thanks in advance.

My System SpecsSystem Spec
09 Aug 2011   #2

Windows 7 Ultimate x64 SP1

What wireless card is it? What motherboard do you have in your new PC (or what's the computer model, if it's an HP, Dell, etc)? Do all of the other PCs run the same version of Windows 7 as the new computer?
My System SpecsSystem Spec
09 Aug 2011   #3

Windows 7 Enterprise x64 SP1

How many PCs do you have connected to the wireless router and what type of security do you use for network protection?
If you shutdown/disconnect any of the other PCs will the network go back to it's regular speed or just when you shutdown/disconnect that new PC?
How many PCs do you have to disconnect so that the network behaves like it should?
My System SpecsSystem Spec


 Windows 7 breaking WLAN

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