Dell Profit Rises  NEW YORK (Reuters) - Dell Inc.&lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=DELL.O target=/stocks/quickinfo/fullquote"&gt;DELL.O&lt;/A&gt;, the world's largest  personal computer maker,  on Thursday posted a higher quarterly  profit, helped by market share gains and lower component costs  despite slowing demand for corporate PCs.