I-tunes store error - an unknown error occurred (-50)

Question

Everytime i go on itunes and try to log into the itunes store, I type my username and password into the relevant boxes and click ok and then
get this error: "could not complete your itunes store request. an unknown error occurred (-50)". Itunes is connecting to the internet as its updating the advertisements but it comes up with the error as soon as I click "log in" almost as if it cant connect to the internet.
as I click "log in" almost as if it cant connect to the internet.
I've tried doing everything that i can find on the net. Enabling and diasbling the parental settings, removing and re-installing itunes and quicktime seperately. I've also tried doing the command prompt things. I dont have any Web accelerators or Ad filters - I'm just using windows firewall.
I've run a diagnostics test and heres the results:
MicrosoftWindows XP Professional Service Pack 3 (Build 2600)
GBT___NVDAACPI
iTunes10.5.0.142
QuickTimenot available
FairPlay1.13.35
AppleApplication Support 2.1.5
iPodUpdater Library 10.0d2
CDDriver 2.2.0.1
CDDriver DLL 2.1.1.1
AppleMobile Device 4.0.0.96
AppleMobile Device Driver 1.57.0.0
Bonjour3.0.0.10 (333.10)
GracenoteSDK 1.9.3.494
GracenoteMusicID 1.9.3.106
GracenoteSubmit 1.9.3.136
GracenoteDSP 1.9.3.44
iTunesSerial Number 0013A88C07AE2348
Currentuser is an administrator.
Thecurrent local date and time is 2011-10-21 18:53:57.
iTunesis not running in safe mode.
WebKitaccelerated compositing is enabled.
HDCPis not supported.
CoreMedia is supported.
VideoDisplay Information
NVIDIAGeForce 8800 GS
****External Plug-ins Information ****
Noexternal plug-ins installed.
iPodService10.5.0.142 is currently running.
iTunesHelper10.5.0.142 is currently running.
AppleMobile Device service 3.3.0.0 is currently running.
****Network Connectivity Tests ****
NetworkAdapter Information
AdapterName:                {5E7F8C2B-0095-469F-B7BC-B273D6B7D815}
Description:                NVIDIA nForce NetworkingController - Packet Scheduler Miniport
IPAddress:                192.168.2.3
SubnetMask:                255.255.255.0
DefaultGateway:                192.168.2.1
DHCPEnabled:                Yes
DHCPServer:                192.168.2.1
LeaseObtained:                Fri Oct 2118:52:18 2011
LeaseExpires:                Fri Oct 2118:53:58 2011
DNSServers:                192.168.2.1
ActiveConnection:                LAN Connection
Connected:                Yes
Online:                     Yes
UsingModem:                No
UsingLAN:                Yes
UsingProxy:                No
SSL3.0 Support:                Enabled
TLS1.0 Support:                Enabled
FirewallInformation
WindowsFirewall is off.
Connectionattempt to Apple web site was successful.
Connectionattempt to browsing iTunes Store was successful.
Connectionattempt to purchasing from iTunes Store was unsuccessful.
Anunknown error occurred (-50).
Connectionattempt to iPhone activation server was unsuccessful.
Thenetwork connection timed out.
Connectionattempt to firmware update server was successful.
Connectionattempt to Gracenote server was successful.
Lastsuccessful iTunes Store access was 2011-10-21 18:43:02.
Thanks! i just want to update my IOS on my iphone!

Answer 1

Windows error
http://support.microsoft.com/kb/2801987
or try that
https://discussions.apple.com/thread/3901065?start=0&tstart=0