Hi. I've been reading a lot of treads on this topic, but found no solution on my problem:

Conected, but no internet
After setting up a wireless ad-hoc network to use the one PCs internet conection, the PC with the internet conection could no longer conect to internet it self. Alltough it was conected and the other PCs where surfing throug its internet conection, no webpages where shown.

Solution
I just now realised it was a DNS problem. The internet conections TCP/IP protocol was set to automaticly obtain DNS, whitch is correct. The problem was that the lokal networks TCP/IP also had this setting and were active. I checked out the box for the TCP/IP on the local network conection. Now it's working fine, and I'm surfing all over the www.

Ok. I hope my eksperience might help someone.

Welcome to our forum, MrOlsen, and thank you for your post. Good information is always great to have around.