Some routers must manually connect to the Net.
Find out your default gateway and type that address into your
browser.
Log in and find the part that allows you to connect and disconnect
the router from the Net.
If it doesn't work, you will have to install drives. Since you said
you are using a PCI wireless router, chances are necessary drivers
for this router are not installed. Get the CD out and install the
drivers and reboot if necessary.