SYMANTEC CORP. $17 (Nasdaq symbol SYMC; Aggressive Growth Portfolio, Manufacturing & Industry sector; Shares outstanding: 806.2 million; Market cap: $13.7 billion; Price-to-sales ratio: 2.3; No dividends paid; WSSF Rating: Average) makes software that protects computers from viruses and intruders. Computer sales have risen with the recent launch of Microsoft’s Windows 7 operating system. Symantec has deals to pre-install its Norton Anti-Virus software on new computers, so it stands to gain as more consumers buy new computers to get Windows 7. As well, the company has shifted its focus to selling services to its business customers. Long-term service contracts give Symantec more predictable revenue streams, and cut its risk. In Symantec’s third quarter, which ended January 1, 2010, its earnings before one-time items fell 7.4%, to $326.0 million from $352.0 million a year earlier. Earnings per share fell 4.8%, to $0.40 from $0.42, on fewer shares outstanding. Revenue rose 0.8%, to $1.55 billion from $1.54 billion. Symantec gets about half of its revenue from outside the U.S. If you adjust for foreign-exchange rates, revenue would have fallen by 3%. Symantec continues to invest heavily in research. It spent $210.0 million (or 13.6% of its revenue) on research in the latest quarter. That’s up 8.2% from $194.0 million (or 12.8% of revenue) a year earlier. The stock trades at just 11.6 times the $1.47 a share that Symantec is expected to earn in 2010. Symantec is a buy.