Can you be more specific about your statement "the network did not build"?
In general, there are two steps involved in building network datasets:
1. Create the network dataset - this is what happens after you specify the cost attributes, connectivity model, etc. Once you are finished in the network dataset creation wizard, it will "create" the dataset (i.e., establish the internal schema based on your specified cost attributes, etc.). However, this process does not establish connectivity or populate attribute information. This is typically done in a follow-up process. The wizard will usually "create" the dataset and then immediately ask if you wish to "build" the dataset (see below).
2. Build the network dataset - this establishes the connectivity and attribute information to be stored in your network dataset. Until this process is complete, you will not be able to perform analysis on your dataset.
Have you verified that you actually tried to "build" the dataset and not just "create" it? If not, please run build on the dataset and see if that fixes your issues. If that is not the problem, then please post back with more specifics about why you think the network did not build correctly.