Whether you're trying to connect to your modem wired or wirelessly, you need a driver for the network adapter(s).
For the onboard Ethernet (wired) you need this driver.
Depending on which WiFi card you have (assuming you have one), it could be either this one or this one. Check your system config paperwork to find out which one you need or use your Service Tag on the Support page to find the right drivers, though it sometimes misses some drivers when you search by Service Tag.
And, you should have installed the two Intel chipset drivers, here and then here, as the first two drivers installed after loading Win 7. Without the chipset drivers, other drivers may not install or may not work.
Other drivers you need are for video, audio, and Intel Rapid Storage Technology
Forum Member since 2004
I am not a Dell employee