Computer Associates to Cut 800 Jobs  NEW YORK (Reuters) - Software maker Computer Associates  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=CA.N target=/stocks/quickinfo/fullquote"&gt;CA.N&lt;/A&gt;on Wednesday said it would cut 800 jobs, or 5 percent of  its work force, in one of its biggest cost cutting efforts amid  weaker demand and falling prices for software and services.