My Vostro laptop is a couple of years old and only had wireless G capability. I found that you can replace the Wi-Fi card in this laptop very easily. I googled around trying to find a generic card to use because we all know Dell will sock it to us with their replacement branded card. I found the Intel 4965AGN MJP card would work on this Vostro 1500. Be careful to get the same part number, the last 3 letters come in a variety of models for different laptops like HP or Lenovo.
You can watch the video for the installation which will take under 5 minutes for the complete upgrade to wireless N. If you have Windows 7 no drivers are required, Windows 7 detects the Intel card and properly installs the necessary drivers.
The speed increase is great. I was averaging 22Mbps with wireless G, the wireless N upgrade got me to 75Mbps. I highly recommend this upgrade if you have an old laptop, I was able to find this Intel card on Ebay with shipping for $18.
Watch the video for complete installation