You said:
Broadband /DSL connection
So is that not good enough? Is that connection made by some telecom link either Ethernet or Wi-Fi? I will assume it is a 3G type connection similar too a smartphone data connection.
You need the Ethernet LAN to allow other devices in your home or office, such as a iPad or printer?
If you have n Internet connection, you need to get the right Retek drives.
I Google for:
realtek rtl8168 and 8111 family pci-e gigabit ethernet driverAnd find:
http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=5&PFid=5&Level=5&Conn=4&DownTypeID=3&GetDown=falseClick on
Global on the line that has the Vista driver.
You will need to install this on your Vista computer.
My experience with Realtek is that you have to use the install program they offer. Windows itself somehow can not install the driver.
It is a ZIP file. You have to extract all before you can run it. Look in the README folder after you extract all.
Let use know if that works for you. If not, there may be another way.