PC tools and antivirus software maker Symantec today said it will acquire the struggling Quarterdeck and beat revised Wall Street estimates by 1 cent when it reported its second-quarter financial results. Symantec said it has signed a definitive merger agreement with Quarterdeck, which makes PC performance software tools, for about $65 million in cash. The boards of directors of both companies have approved the acquisition and Symantec expects to complete the transaction by the end of November, pending regulatory and shareholder approval. The company will also assume Quarterdeck's outstanding debt as part of the deal. The Quarterdeck deal comes a few weeks after Symantec acquired Intel's antivirus business. Meanwhile, Symantec posted net income of $6.8 million or 12 cents per share, compared to net income of $20.6 million or 35 cents per share for the like quarter a year ago.