Losing internet connection on Wi-Fi (Nokia E52)

Hi Everyone!
I have:
1) PC (Windows 7) with ASDL internet (D-Link DSL-200) and USB Wi-Fi Adapter (TP-Link TL-WN821N)
2) Two netbooks (Windows XP)
3) Smartphone Nokia E52
I want to: share the Internet from PC to other devices via Wi-Fi adapter.
The problem: on PC Wi-Fi connection disconnects with smartphone. But on smartphone, connection is active, the smartphone sends the packets, but the PC is not responding
Updates, drivers, firmware:
Windows 7 - all the latest updates.
Windows XP - all the latest updates.
D-Link DSL-200 - installed the latest driver.
TP-Link TL-WN821N - installed the latest driver.
Nokia E52 - installed the latest firmware (091.003 \ 03-Apr-2012)
I was standing on a PC Windows XP. First I tried the program Connectify Pro. Speed is low, not always connected. I created connection manually by Ad-Hoc mode (I manually prescribed IP and DNS addresses). On netbooks, connection is good! But the problem is with the smartphone. Sometimes the connection is lost, on PC Wi-Fi connection disconnects with smartphone. But on smartphone, connection is active, the smartphone sends the packets, but the PC is not responding. I thought, that USB Wi-Fi adapter's power saving is active, but it was disabled. My friend recommended installing Windows 7. I’ve install it. The same thing ... (on PC Wi-Fi connection disconnects with smartphone. But on smartphone, connection is active, the smartphone sends the packets, but the PC is not responding). Situation is the same in Ad Hoc mode and in SoftAP using MS Virtual Wi-Fi or Connectify Pro.
Is there any solution?
By the way! I forgot to say, if any of netbook will be connected to the PC via Wi-Fi, the smartphone does not lose internet connection, but turning off the netbook creates the same problem after minutes (on PC Wi-Fi connection disconnects with smartphone. But on smartphone, connection is active, the smartphone sends the packets, but the PC is not responding).
Wi-Fi connection on netbooks is good, internet works, no disconnects.
I read on the Russian forums, that such a disease is on all Nokia S60 smartphones.
P.S. Sorry for my bad English.

Hi AssIsBack,
Thanks for your feedback and welcome to the forum.
From your description I make it you are creating the ad-hoc connection using the TP-Link TL-WN821N? As a general rule it is not advisable to use ad-hoc for 'permanent' WLAN connections. This is more intended for quick 'point to point' connections and is generally considered to be both unstable and insecure. Also it could be you are using the same USB hub on your PC to connect both the modem and the WLAN interface which may cause these two devices to interfere with each other.
I would strongly suggest you replace the D-Link DSL-200 with a modem which has a WLAN accesspoint built in. You will find this will increase your networks dependability and speed. It will also allow you to have your PC turned off and still be able to use WLAN with your phone.
Kosh
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