ATI Radeon HD 4850 drivers for Windows XP

Download includes:

Display Driver
ATI WDM Integrated Driver
Catalyst Control Center - allows you to take advantage of all the features of your ATI graphics card.

Download drivers Windows XP

ATI Radeon HD 4850 drivers for Windows Vista
Catalyst Software Suite (64 bit) English Only
Display Driver ATI WDM Integrated Driver
Download Drivers for Vista