Another option is to try a Gigabit Ethernet Adaptor.   Google for more info but I suggest not to bother unless your computer has a USB 3.0 port.     
Recently upgraded broadband speed to 150MB.   Inspiron 1525 - Network adaptor allows max 100 MB. Can I upgrade the network adaptor?  Is it easy to do yourself or does it require the help of a service technician?
Upgrading the network adaptor