The sound driver it's installed by windows and the external speakers work.
My system specification are this:
Processor: AMD Sempron(tm) Processor 3600+, ~2.0GHz
Memory: 2048MB RAM
Operating System: Windows 8 Pro 32-bit (6.2, Build 9200) (9200.win8_rtm.120725-1247)
Card name: ATI Radeon HD 5450...