I BOUGHT AND INSULTED THE BELKINS N WIRELESS USB ADAPTER ON MY DESKTOP COMPUTER THAT USES WINDOWS XP. I ALSO BOUGHT A $1300.00 VAIO SONY LAPTOP WITH WINDOWS 7 AND TRIED TO DOWNLOAD THE SAME WIRELESS PROGRAM AND CAN NOT SEEM TO GET ON LINE. ON SOME OF YOUR WEB SITES Q & A., SOME SAY YOU CAN USE WITH WINDOWS 7 AND SOME SAY NO YOU CAN'T. I WENT TO A MORE EXPENSIVE BELKINS USB ADAPTER & IT SPECIFICALLY STATES - CAN NOT USE WITH WINDOWS 7. WHAT DO I DO NOW? thank you BOBBIE

Not all laptop computers have built-in wireless capability,
but all the newest ones do.

You may need to purchase either a PCMCIA or a USB wireless-adapter, and insert the adapter into the appropriate slot, to add wireless capability.

You need to go to the manufactor's website and download the driver you need for your current windows version.

Here and here are some basic steps to check.
MS troubleshooting guide here.
More general network setup info here and here for xp, here for vista.
That may get you going in the right direction...

I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
If I've managed to answer your question or solve a problem, please take just a moment to rate this post....thanks!

Same Problem I am facing too. I am also having SONY VAIO VGN-CS21GN

Good day!!! I know the link for the VGN series for windows XP drivers you can download the drivers there ( http://www.getpcmemory.com/drivers/download-sony-vaio-vgn-series-notebooks-windows-xp-drivers/ ) hope this one can solve your problem.Cheers and God Bless.

Press the CONNECT buttons located on the left panel of the computer and then press the connect button on the bottom of the keyboard, to establish communication.

Wireless Adapter Installation

A. Install the software.

Note: Firewall and anti-spyware need to be disabled. They sometimes treat software installation as a behavior of a spyware and therefore will prevent installation.

Windows XP:

1. Please power on your computer. Allow the operating system to boot up completely and log in as needed.
2. Insert the NETGEAR adapter Resource CD into your CD-ROM drive. The CD main page shown at the right will then load.
3. Click the Install Driver & Utility.
4. Please make sure that you follow the Install Shield Wizard steps. Click Finish when done and turn off your computer.

Windows 2000/ME/Win98SE:

Note: Windows 2000 may require you to be logged on with administrator rights.

1. Please power on your computer. Allow the operating system to boot up completely and log in as needed.
2. Insert the NETGEAR adapter resource CD into your CD-ROM drive. The setup page will then load.
3. Afterwards, click on the Install Driver & Utility link.
4. Make sure to follow the Install Shield Wizard steps, and click Finish when done to restart your computer.

B. Install the adapter.

Windows XP:

1. Please make sure that you shut down the PC first and then remove the power cord.
2. Please insert the NETGEAR adapter into the available expansion slot.

Note: If you have PCI adapter, connect the antenna to the adapter, making sure the antenna is in the upright position.

3. Reconnect the power cord and reboot the computer.
4. When the Found New Hardware Wizard displays, please click on Next and then follow the prompt. If you are prompted with a Windows XP Logo testing message, just click on Continue Anyway.
5. After the installation completes, click Finish to close the wizard.

Windows 2000/ME/Win98SE:

1. Please make sure that you shut down the PC first and then remove the power cord.
2. Insert the NETGEAR adapter into the available expansion slot.

Note: If you have PCI adapter, connect the antenna to the adapter, making sure the antenna is in the upright position.

3. Reconnect the power cord and reboot the computer.
4. On the Found New Hardware Wizard, click on Next, then follow the prompt to proceed.
5. After the installation completes, click Finish to close the wizard. Please make sure that you can see the NETGEAR icon located at the lower right portion of your computer screen.

Note: If Windows displays Digital Signature Not Found warning, click Yes to continue.

C. Configure the NETGEAR adapter.

1. Please Double click on the NETGEAR icon on the right lower end portion of your computer.

Note: If you do not see the icon, click on Start and go to Programs. Locate the NETGEAR Utility and click on the NETGEAR Smart Configuration Utility.

2. Click on the Networks tab.
3. Click on the Scan button.
4. Select the Network Name or SSID of your wireless network.
5. Click on the Connect button.
6. You will be directed to the Settings tab.
7. Type a name for the Profile.
8. The Network Name (SSID) will be the same with your wireless network.
9. Make sure that the Network Type is set to Access Point (Infrastructure).
10. Select the Security that you are using on your wireless router.
11. Click on Save Profile.
12. Click on the Apply button.

check the connection frequency it might not be the same on your laptop and your wireless in which case you'll need to get one that is.

get your money back for the card, and try one from a different brand.

You should be able to use any usb wireless network adapter, or any cardbus type II wireless adapter. BUT if you are running windows 98 or ME or an older version than xp... before you purchase one, go to the manufacturer site and be sure that there are drivers for the version of windows that you are running. Here is what to look for and a link to some items that may work.
http://www.newegg.com/Product/Product.aspx?Item=N82E16833129133

http://www.newegg.com/Product/Product.aspx?Item=N82E16833124280