DS Error Code 52003

This error is caused by a connection issue between the Nintendo Wi-Fi Connection and the Nintendo Wi-Fi USB Connector.

To solve this error :

Disable or uninstall any firewall or anti virus software that may be present on your computer such as Norton AntiVirus, McAfee AntiVirus, Zone Labs, AdAware and Spybot Search.

If you are using a wireless router, you made need to make the following changes :

Set your router IP Address to 192.168.2.1.

Access Network Connections located on the Control Panel of your PC.

Find your Nintendo Wi-Fi USB Connector, right click > properties.

Ensure the "Obtatin the address automatically" setting is checked.

Press OK, close the window, and test the connection again. Disable or uninstall any other firewall or anti virus software if necessary.