Oil Fears to Weigh on Stocks; Dell Eyed  LONDON (Reuters) - Oil's rise to new record highs above \$50  a barrel will put pressure on Wall Street on Tuesday as  investors fret over the impact on corporate profits, while 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; will grab focus after it stuck by its outlook.