Companies who have concerns over their staff's broadband use should produce a clear policy advising employees of do's and don'ts while surfing the web, says one expert.
Ben Camm-Jones, news editor of Web-User magazine, has highlighted the number of firms which have had their computers left open to malicious software as a result of staff's activities while using broadband.
Mr Camm Jones stressed that it was the responsibility of the company to lay down clear guidelines relating to internet use at work.
He said: "I think the best practice is that companies really need to establish a very definite policy about what their staff are and aren't allowed to do on the internet and make it very clear to all employees what that policy is."
According to research from Messagelabs, 2,076 new malicious websites were blocked every day in June - representing a rise of 58 per cent from May and the highest number since April 2007.