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WLAN not working after Windows XP SP3

Posted on 2008-10-30
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Last Modified: 2012-06-21
After an atomatic installation of Windows XP SP3, the follwing error appeared on rebooting:
"AirGCFG.exe - Entry Point Not Found. The procedure enry point apsGetInterfaceCount could not be located in the
dynamic link library wlanapi.dll."
I searched for the problem and the recommended solution was to upgrade to a newer version of the WLAN driver (ftp://ftp.dlink.com/Wireless/dwlg122_revC/Drivers/DWL-G122_C1_driver_3.10.zip).
I did that and the DLL error disappeared.
Now I'm no longer able to use an encrypted WLAN connection. Before the update I used WPA2 PSK.  With encryption turned on, the WLAN adapter now seems to connect but is unable to aquire an IP address from the router. Unsecured WLAN works without problems and connects within seconds.
I tried to configure the WLAN connection with the XP tool and the DLink tool, same result. Any ideas?
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Question by:Michael Pfister
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by:geekhelp4u
geekhelp4u earned 1600 total points
ID: 22840567
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by:Michael Pfister
ID: 22840643
This fix is included in SP3. http://support.microsoft.com/kb/946480
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by:geekhelp4u
ID: 22840780
What version of the DWL-G122 do you have?

On the label it should say H/W Ver:
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by:Michael Pfister
ID: 22840953
Not on site now, I believe C1
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by:geekhelp4u
ID: 22841004
might double check... on Dlinks main page they just have an A1, A2, B1 and D1

It also looks like 2.1 was the latest driver built for XP with 3.1 being a Vista driver
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by:Michael Pfister
ID: 22841154
The readme states different:

DWL-G122 V.C1 Driver/Utility Release Note  
File Name: D-Link DWL-G122.B1v2.04 G122.C1v3.10 Build 61612 S0032 (ML15).zip
Hardware: DWL-G122(rev.C) (Ralink RT2571W+RT2528)
Utility version : V3.10 (15 languages for EU)
Driver Version: V1.0.1.0 (Win 2K/XP/98/SE, XP-64-bit)
Vista Driver: use XP driver 1.0.1.0
Utility : 3.10 Build 61614 S0032
Date: 2007/4/14

Hardware: DWL-G122(rev.B) (Ralink RT2571+RT2526)
Utility version : V2.04
Driver Version: V2.0.1.0 (Win 2K/XP)
Driver Version: V2.1.0.0 (Win 98/ME)
Driver Version: V2.0.3.0 (XP-64-bit)

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by:dannyyo
dannyyo earned 400 total points
ID: 22843861
It seems that XP sp3 breaks certain things that were working previous to install.  I've seen it where it messed up the ability to rotate the monitor.
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Michael Pfister earned 0 total points
ID: 22865792
I tried to upgrade the router (Draytek Vigor 2200VG) to a newer firmware, but the router resets everytime an upload is started...

Therefore I replaced it with my test router and now I'm able to use WPA... very strange. So the computer seems to be ok, the WLAN stick is ok. Its a problem with SP3 and the router...
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