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Hi All... Im a little stumped with this one - hopefully someone can give me some direction!!

I have a small wireless Network set up, to which I have up to 7 devices connected. (PC, 4 Laptops, Iphone and a Wii).. Generally there is only 2 -3 devices connected at a time.

I do not have any issues with my laptops or other wireless devices, but for some reason, whenever I turn on my PC, it seems to slow down and eventually crash the internet connection for everyone! I have run a ping test from my laptop, and can see a significant degradation and packet loss as soon as the home pc starts starts windows and then within seconds of turning off the pc, the connection returns to normal.

Currently the PC connects to the network over WIFI but I also experienced this problem with a cabled network connection to the router. I have even tried booting the computer with both cards (WIFI and NIC) disabled and this caused the same problem. So far i have done the following troubleshooting:
* Formatted HDD and reinstalled everything
* Moved the PC away from the modem / router - they now at opposite ends of a smallish townhouse on different levels.
*Replaced the wireless Network card

Im really not sure what to try next. The PC has recently undergone a hardware upgrade and has had a new motherboard and Power supply. Is it possible that there could be some sort of electrical interference which is killing the adsl2 signal on the phone line? Has anyone else seen or heard of anything like this before? The funny thing is, that during these periods of slowness, I can always browse quickly back to the admin console of the router. So it looks like the internal network connection is OK. Rebooting the router several times will eventually restore a decent network and internet connection to all machines, but this is unreliable and unpredictable (ie. sometimes 2 router reboots will do it, other times 5!)

Here is a little more info:

OS= XP Pro SP 2
ram= 2Gig
gfx= ATI Radeo 3800 Series
rounter=DLink Dsl G604t
NIC= TPLink Wireless 11/b/g (have also tried Dlink wireless NIC)

If anyone has any ideas or some further troubleshooting tips I would really appreciate them! Thanks in advance.

Chris
 

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I don't have much of an idea here, since you seem to have ruled out any virus with the reformat.

Have you tried a wired connection with the PC to see if that changes the symptoms?
 

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You might want to try a utility like Wireshark to monitor the traffic when you turn on the desktop PC. It could be that the card is bad and is sending out a lot of traffic that is overloading the router. I had this exact problem except with a wired NIC.

Edit: Hah! i guess should have read your post more thoroughly cause i just saw that you replaced the card already. I would still do the Wireshark thing though
 
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