Try do download directly from the manufacturer.

Don't worry about it.
Download driver, and let it unpack to ATI(AMD)\Support\"whateverversionyouuse" folder.
Then, exit installer and go to Device Manager.
Pick your "VGA Compatible" device (that should be your GPU), and from it's propietes pick Update Driver.
When ask for Autoinstall/Manual - pick Manual
When ask about driver folder, pick "I will pick driver to install" option.
Then you click on "Have a disk" and you browse to folder where installer unpacked itself.
Deault is : "OS drive":\ATI\Support\"whateverversionyoupicked"\Packages\Drivers\Display\
"whateverOSyouareusing"\xxxxx.inf
After you pick that file, in next window you should get list of compatible devices.
If setup didn't find your gpu, you have to pick it yourself from list (it's either listed as "4650" or "4600 series").
Confirm you want to install that driver and let setup do it's thing.
After it's done, restart your PC, and you should be good to go.

ALWAYS let the unsigned driver install.

If that doesn't help, it may be a dead GPU, OR (more likely) MB isn't compatible eith that card.
Remember that DX10 series cards all have PCI-e to AGP bridge chip on PCB.
If your MBs BIOS doesn't like it - GPU will not work correctly regardless of what you do.

PS. HD 4650 driver is too CPU heavy to use that GPU efficiently.
You would be better off with X1950 Pro in that PIII setup.

Thank you for your answers,

At first it seemed better with the manufacturer driver since it completed the installation. It's this one : https://www.asus.com/Graphics-Cards/AH4650DI1GD2/

But I got a black screen at the next boot. Same black screen as with the previous driver but during boot. I can still boot in fail-safe mode. Uninstalled it and tried again, this time with .NET framework installed since I had a message telling me the catalyst drivers need them, but same result, either black screen or windows discards the driver and fallbacks to its default vga driver.

I feel a bit unlucky. I'll try with another motherboard, i have an oem 'Gateway' one which is based on 440BX, but i doubt it will work, it's older than the via 133A chipset

I'm pretty sure you can't use HD 4650 on 440BX because that chipset doesn't support 1,5V AGP (it's 3,3V only), and your card requires AGP 1,5V or lower to work (check notches on AGP port and AGP slot before installing).

However I can be wrong...

Does the trick work for 4670 Agp cards in Win98?

Which catalyst driver version should I download?

okenido wrote:

Thank you for your answers, […]
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Thank you for your answers,

At first it seemed better with the manufacturer driver since it completed the installation. It's this one : https://www.asus.com/Graphics-Cards/AH4650DI1GD2/

But I got a black screen at the next boot. Same black screen as with the previous driver but during boot. I can still boot in fail-safe mode. Uninstalled it and tried again, this time with .NET framework installed since I had a message telling me the catalyst drivers need them, but same result, either black screen or windows discards the driver and fallbacks to its default vga driver.

I feel a bit unlucky. I'll try with another motherboard, i have an oem 'Gateway' one which is based on 440BX, but i doubt it will work, it's older than the via 133A chipset

Is the screen black entirely or is it just extremely dark in such a way that it is unusable? I once had an issue with an extremely dark screen with my ATI Radeon 6370M and the Catalyst drivers, so I went into Safe Mode and I changed the brightness settings in the registry, which fixed the problem for me. At first I thought as well that the screen was black, but when I looked better, I noticed that the screen was extremely dark instead of black. 😜