Symantec said today it was investigating concerns raised by a former employee as the cyber security company forecast full-year results below analysts' estimates.

The company, which makes Norton Antivirus, said its financial results and forecast may change based on the outcome of the internal investigation.

The probe is being led by an audit committee of Symantec's board.

The company said the investigation was not related to a security concern or breach in its products or systems. It did not provide any further details. 

The committee has retained independent counsel and other advisers to assist in the investigation, Symantec said. 

The investigation, in its early stages, is unlikely to be completed to file the annual report in time, according to the company. 

Symantec has contacted the Securities and Exchange Commission and plans to provide additional information to the SEC as the investigation proceeds. 

On its post-earnings call Symantec canceled its customary question and answer session with analysts. 

The California-based company forecast full-year revenue between $4.76 billion and $4.90 billion, missing analysts' average estimate of $4.93 billion, according to Thomson Reuters. 

Symantec's full-year profit outlook of between $1.50 and $1.65 per share also came in below estimates of $1.80. 

Revenue from the company's enterprise security unit, which accounts for most of its sales, fell 7.2%.

The company's net loss narrowed to $35m, or six cents per share, in the fourth quarter, from $143m, or 23 cents per share, a year earlier. 

Excluding items Symantec earned 46 cents per share. Revenue rose 10% to $1.22 billion. 

Analysts were expecting the company to report a profit of 39 cents per share on revenue of $1.19 billion.