After I received the 18.104.22.168 update, the PC have started to freeze just like that. It seems that it mostly happens while the browser is loading site content. It happened once while Wilders was loading for example, even though there's not much to load here. And the freeze is usually between 10-30 Seconds. I use 32-bit XP Home SP3 Fully updated. And I browse with Safari 5.0.5. I don't use any other security software in real-time.