AMD will not release the new drivers for graphics devices that support 32-bit operating systems. Therefore, the set of Radeon Software Adrenalin Edition 18.9.3 drivers, which received the Microsoft WHQL certificate the day before, became the last supporting 32-bit systems. The refusal to support the old OS due to their low popularity among users, more than 97% of the systems on the computers of gamers is 64-bit (supporting operation in multi-core mode and having the ability to «see» more than 3.25 gigabytes of RAM).
The main competitor of AMD in the graphics segment, Nvidia refused to release the drivers working with 32-bit OS a year ago, therefore, the manufacturer of Radeon cards for as long as possible to support its users and refused it, only after their almost complete transition to 64 bits.