Gateway Shifts Back to Personal Computers  NEW YORK (Reuters) - Gateway Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=GTW.N target=/stocks/quickinfo/fullquote"&gt;GTW.N&lt;/A&gt; on Monday said it  would return to its roots as a personal computer company,  backing off on an aggressive strategy of expanding into TVs,  digital cameras and other gadgets in a move to return to  profitability.