HP Rolls Out Ultra-Low Priced PC in China  HONG KONG (Reuters) - Hewlett-Packard Co. &lt;A HREF="http://www.reuters.co.uk/financeQuoteLookup.jhtml?ticker=HPQ.N qtype=sym infotype=info qcat=news"&gt;HPQ.N&lt;/A&gt;, the  world's number-two PC maker, said on Friday it has launched a  3,999 yuan (\$483) computer in China, turning up the heat in the  intensely competitive market.