Hi, I had the same issue and was about to trow the card away.
The solution is simple.
Download the latests drivers from Leadtek site (WinXP/2000) here, if the link doesn't work got to the site www.leadtek.com and do a drivers search for A280 and should get the link.
What you got in the download is an .exe file (W2K_NVALL_41124.exe), which in reality is a zipped file, the exe just runs to unzip first then automatically launches the application to install the driver. So here is the first Trick : If you have Winzip or Winrar, you should be able to RIGHT click this exe file (W2K_NVALL_41124.exe) and unzip it somewhere you can locate it later on.
Once unzipped you will end up with a set of files and a folder called "WinXP_2K", inside this folder are all drivers U need.
Now go to Device Manager (start/CtrPanel/Hardware&Sound/Device Manager)
Look on the top of the list (3rd of 4th) for "Display Adapters) and click on the +
You should see the Windows default driver installed, right click on it and press the first option "Update Driver Software"
A window pops Up , select the "Browse My Computer for Driver Software" Option
Select "Browse" and locate the folder with the drivers we unziped in step 3 "WinXP_2K".
Follow the prompts and ignore if Windows tells you this is not an Certified blablabla.
Your Winfast Driver should kick in , and that's it.
It's an old Geforce4 Ti 4200 card. I doubt that you'll find Vista or Win7 drivers for it.
You may be able to force the XP drivers to install, as Soco suggested. You won't get Aero Glass effects, but I believe that most people can live without them.