HP dv6000 Connection problems

My HP dv6000 laptop with Windows XP Media Center Edition won't access the internet any more. Not even if it's connected directly to the modem, or wired to the router, or wireless. I have a desktop and second laptop connect with no problem. The modem and router are both Linksys. When you mouseover the icons in the tray, the status is always Speed 100.0 Mbps and Status: Connected. I don't understand how two computers can connect to a wireless router and my HP Pavilion can't. I have unplugged the modem and router and restarted them both, but to no avail. Any help would be appreciated.