DSL Modem Problem Error 678
Error 678 sometimes occurs when, after installing Windows XP Service Pack 2, you try connecting to the Internet with a DSL or cable modem to no avail. This often comes about as a result of an improperly configured modem. The error can be resolved, although you may have to try several different solutions before you find one that works for your particular system.
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Basic Checkup
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You want to start by making certain you installed the modem correctly. For instance, ensure that the cable properly is fitted on both ends -- to your computer and the modem. Also, check whether the network adapter is enabled. You can find this option in the "Local Area Connection" settings, which is most easily accessed via the ncpa.cpl command. The last option is to just reset your modem, as it may just need to reconfigure itself to the new network connection.
Reinstallation
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You may have to reinstall your modem after installing Windows XP, especially if the modem drivers supplied by the OS are not compatible with your particular modem. This entails loading up your "Device Manager," locating the modem and removing it altogether from your system. The key is to then use the installation disk provided with your modem to perform a proper install. Where problems typically occur is when users rely on Windows-based drivers -- which more often than not are out of date.
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Connection Repairs
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One option is to repair your network connection by using the "netsh winsock reset" line command. If this doesn't fix the error, you could try removing the connection from the "Network Connections" window and then creating a new one. Also, ensure that the connection has the proper DHCP and IP settings or, if your provider calculates DHCP automatically, that the "Obtain DNS Server Automatically" option is checked off in the connection's TCP/IP window.
Third-Party Removal
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It is possible that a third-party software suite or malware program you purposefully or accidentally installed is interfering with your ability to connect to the Internet. To fix this, you need to temporarily disable or uninstall any third-party firewall software on your system while ensuring the default Windows XP firewall is still active. You should also scan your system for viruses, spyware and adware. If you encounter any such malicious files, your best bet is to reinstall XP again.
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