Recent trouble with wifi connection

Lately when I try to go online on my pc, I cannot connect initially. After clicking on the toolbar Internet icon and clicking on "repair", I am able to get online. My pc is connected by wireless to another pc that is connected directly to dslextreme, which works well. And the wireless connection to the pc in question (using a Hawking USB Hi-Gain Dish Adapter) reports that it is up and running well. So I figure it must be a setting on my pc that needs to be changed or tweaked. Thanks for any suggestions. Mike