Dual band wi fi wont install

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have you tried here, Dual Band Wi Fi Dongle 600 Windows software Help BT com Help

"device driver software was not successfully installed"
Find the correct driver for your computer and operating system.

Is the Netgear Wi-Fi Management software installed on the computer? If it is, you may have a conflict between Window's built in Wi-Fi Manager and the Netgear Wi-Fi Manager. If it isn't, you may need to install it.
Assuming it isn't, there's links to download the software at the Netgear Global Download Center.

I would default to the most current version, if you're running Windows XP, you may need to install the v2.1, however, I would assume the v3.1 would be backward compatible with XP.
Install the software and follow the prompts that will guide you through the installation/setup.
Now, if the software is already installed, you need to find the program and configure it through that avenue. If that does not fix the issue, you should uninstall the Netgear software, remove the Wi-Fi adapter and reboot the computer. After it completely boots back up, you should either plug in the Wi-Fi adapter, let Windows recognize it and install the drivers, (they should still be in the system even after you uninstalled the software). Once Windows successfully locates and installs the drivers, reboot the computer again, (no need to remove the adapter). Once Windows completely loads again, open Start, Control Panel, and System. On the resulting window, click the hardware tab at the top then click the "Hardware Manager" button in the middle about 1/3 down the window. Click the "+" next to "Network Adapters" and verify that your WN111v2 is indeed installed.
Assuming it is at this point, close out everything but the Control Panel and open "Network Connections". Find the wireless adapter there, (may be listed as "wireless connection2" depending on how many times it's been installed). Right click on the wireless device and select "Show Available Wireless Networks"

I'm also uploading a video showing what needs to be done.
Establishing WiFi Access in WinXP

IBM Thinkpad T22 doesn't have Wi-Fi adapter installed. you need a USB Wi-Fi adpater in other to have Wireless connection.

You can go for D-Link, 3COM,belkin USB Wi-Fi adapter. Make sure the USB Wi-Fi adapter support the Operating System you installed.

Good Luck.

This model has one of two makes of Wifi card/chip installed its either;

1 Intel® Wireless WiFi Link 4965AGN (dual-band quadmode
802.11a/b/g/Draft-N) Wi-Fi CERTIFIED® network
connection, supporting Acer SignalUp™ with InviLink™
Nplify™ wireless technology

or
2 Intel® PRO/Wireless 3945ABG (dual-band tri-mode
802.11a/b/g) Wi-Fi CERTIFIED® network connection,
supporting Acer SignalUp™ wireless technology

If you have the incorrect driver it wont install
Hope this helps
here are the links for you to download the correct ones
http://global-download.acer.com/GDFiles%5CDriver/Wireless%20LAN/Wireless%20LAN_Atheros_%207.2.0.215_VistaX86.zip?acerid=633639023394558300&Step1=Notebook&Step2=Aspire&Step3=Aspire%202920&OS=V10&LC=en&SC=PA_7


and

http://global-download.acer.com/GDFiles%5CDriver/Wireless%20LAN/Wireless%20LAN_Broadcom_%204.170.25.19_VistaX86.zip?acerid=633639023397522319&Step1=Notebook&Step2=Aspire&Step3=Aspire%202920&OS=V10&LC=en&SC=PA_7

dont worry ppl i fixed it, i found out that my internet connction that was going through the W-Fi adatper, wasnt accepting echo requests. but it works now.

Start - control panel - system - hardware -device manager. 
Right click on your " wi-fi", once it is installed and turned on.
Right click again on "update driver"
follow prompts

when you are advised to connect the usb adapter, it will recognise it, then the usb host controller is installed to recognise the adapter,but it should continue to instal the driver and then recognise it as Belkin 54g, if not, then you need to keep the cd rom in and then force it to install the driver from your cd drive, but it may not be compatable with ME unles you have a windows 2000 driver.

When the installation is complete you should in any case have the belkin software icon on your desktop to set up the adapter, if not then the software has not installed fully.

It will also be listed in add/remove programmes if it's fully installed.