If the netbook has an ethernet (network) socket I'd start by connecting to your router via that (there's usually a cable in the box the router came in).
If you can get that working move on to wireless.
Can't be more specific as Win CE is a mystery to me. In regular Windows I'd also do this:
Check TCP/IP Properties.
Start, Connect To, Connection, Properties, Scroll Down TCP/IP and highlight, click Properties and check that Obtain DNS and IP address automatically are enabled.