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Lost Wireless Networking Capabilities on Sony VAIO VGN-S260P

Problem:  I've lost wireless networking capabilities on my Sony VAIO VGN-S260P.  O/S is Windows XP SP3.  Wireless network adapter is Intel PRO/Wireless 2200 BG.

Question:  Do you suspect this to be a hardware issue (i.e. wireless adapter, motherboard), an O/S issue or some other issue?  What other steps can I take?

1.  Wireless internet connectivity not functional -- was intermittent for about a week and machine would sometimes freeze and require a restart.
2.  Wireless adapter no longer being recognized by machine -- in Device Manager the wireless adapter is not present.
3.  On system startup I receive the Error message "Resource Conflict PCI in Slot 03, Bus: 02, Device: 0B, Function: 00."  I have to push "F1" to continue startup.
4.  Machine continuously cycles through startup -- when machine gets to the Windows login screen a "blue screen" briefly appears (from which I can't gather info) and cycles back through startup.  Only way to avoid this from happening is to start machine from last known good config.
5.  Continue having uninterrupted Wired LAN functionality (I'm writing this from the machine in question)
6.  Have verified the wireless access point is functioning properly using another machine.
7.  Have verified the wireless switch on my machine is turned on.
Solutions Attempted without Positive Outcome:

1.  Reseated the wireless network adapter.
2.  Reinstalled all network and wireless LAN drivers + updated for the machine (to include the original network adapter for the machine, Intel PRO/100 VE) in Safe Mode.
3.  Conducted System Restore.
4.  Attempted to start Windows using Last Known Good Config.
5.  Reset BIOS to factory default settings.
6.  Tried manually adding the wireless network adapter through the "Add Hardware" wizard.
7.  Updated virus definitions and conducted a scan to ensure machine is not infected.
1 Solution
WirewingAuthor Commented:
An additional item worth noting:  I attempted to startup the machine while the wireless network adapter was unseated.  I did not receive the Error message "Resource Conflict PCI in Slot 03, Bus: 02, Device: 0B, Function: 00" on system startup, but the machine continued to cycle through the startup process.

Thanks in advance for your suggestions and for your help.
You didn't mention what wireless card driver you're using, but I'll assume it's the driver supplied by Sony.

If it's been more than a year since XP was installed, back up your data and as many settings as possible, format and do a clean install.

After backing up, I would ensure it has the latest BIOS (R0072G4)... if not, flash the latest before a full format, then continue with the re-install.

After installing windows, apply the drivers in this order:
1) Motherboard/chipset
2) Video
3) Network
4) System Components
5) Audio
6) Mouse and Touchpad
then any others you have left, like Wireless LAN, Bluetooth, Webcam, card reader, et cetera.
Then apply any windows service packs and critical updates from the windowsupdate.microsoft.com site.

If that doesn't clear up the problem, then replace the wireless card.
But I rather expect the fresh install of windows to fix it.

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