This is a very complicated direction how to enable the Radeon X 1400 graphic driver on the the Windows 8 or 10.
Why the AMD company can't take more of a care and fix up this problem for us who are using our old beloved computers?
I wish to be doing this way but I don't know if I'm so able when still I can use
This is made by a clever man on the Microsoft community website: Anyone have any luck installing ATI Mobility Radeon on Windows 8? - Microsoft Community
For those interested, here is my workaround:
1. I replaced the HDD with another one that I had just lying around.
2. I installed Win7 on the temporary drive and installed updates to all the device drivers via Windows Update.
3. I shut down the computer and then put my original, intended HDD back into the system and installed Win8.
4. Connected the temporary Win7 HDD to the system via a USB SATA wire.
5. Opened the Device Manager in Win8 and updated the "standard" display driver manually, directing the application to search the /Windows folder (and sub-folders) on the Win7 drive.
6. Win8 then discovered and installed the ATI Mobility Radeon X1400 properly.
I think it is just ridiculous that this roundabout method is required to install a GPU that is already fully supported in Win7. I guess Microsoft's every-other-OS curse continues: From ME, to Vista, and now to 8. Dumb, dumb, dumb.