There are a couple of things I would check here. For one, make sure that you have TCP/IP enabled on your machine. If not, NI Service Locator can not run, so you will want to enable it. Also, if you have Norton Personal Firewall, try this:
1) Open Norton Personal Firewall 2) Double Click on "Personal Firewall" 3) Goto the "Home Networking" tab 4) Add your computer's IP address and "localhost" to the "Trusted" computer list
Hope this helps!
J.R. Allen