Software problems can be the cause of networking problems, as well. When all of the physical possibilities have been eliminated, you'll need to look to the actual system to discover what the cause of the problem may be. A variety of configuration problems may be at the root of the situation, such as those of the WINS or DNS variety. Registry problems may also cause a networking issue, as well as a number of other software-related possibilities. Depending upon the cause of the problem, you'll need to either make configuration changes or, perhaps, reinstall a specific piece of the software that may have malfunctioned.