Just delete what the installation says needs to be installed. You will get a driver installed during the installation. If it says you can reinstall the original driver, go ahead. The installation program just doesn't seem to like wireless during the installation. Make sure you connect to the internet by wire before the installation, as updates will be downloaded during the install.
XPS M1530, 2.0 Ghz Core 2 Duo T7250, 4 GB 667 Mhz RAM, 200 GB 7200 RPM Hard Drive, Nvidia M8600GT Video - 186.81 Driver, Hi Def LCD - 1680x1050, Windows 7 32-bit Home Premium
Inspiron E1705, 2.0 Ghz Core 2 Duo T7200, 2 GB 667 Mhz RAM, 160 GB 5400 RPM Hard Drive, Nvidia 7900 GS Video - 1920x1200 - WUXGA, Vista SP1