Windows 7 Set Default Network Connection

Solution 1:

You should be able to adjust the metric setting for each interface, giving preference to the wired interface. By default, wired interfaces with a faster link speed should be given preference using the automatic metric setting. However, according to TechNet, automatic metric is usually enabled by default.

1. Right-click a network interface, and then click Properties.
2. Click Internet Protocol (TCP/IP), and then click Properties.
3. On the General tab, click Advanced.
4. To specify a metric, on the IP Settings tab, click to clear the Automatic metric check box, and then enter the metric that you want in the Interface Metric field.

(steps above adapted from KB299540)

A lower number represents a preferred interface, since the number represents a cost value for selecting that interface.