I have a Inspiron 1525 laptop running Vista 32 bit. Wireless works fine but I was having trouble with a wired connection. I plug it into my router and it connects for 3 secs, then says network cable unplugged. It repeats this cycle connecting and disconnecting every 5 secs. I tried everything switching router port, cable, firewall, updating NIC driver all with the wireless disconnected. My desktop works on the router as well.
I finally switched the configuration of my NIC, Marvell Yukon 88E8040 PCI-E Fast Ethernet Controller, (the speed) from Automatic to 10 mbps full duplex. 100 full/half would not work as well. Now I'm downloading at half the speed of my wireless connection. I downloaded the latest driver 126.96.36.199 from the Marvell site but still the same. How do I get my NIC to work at 100 mbps?