4% of IT managers do not use anti-virus

90% of IT managers surveyed by Maritz reported that computer performance levels were affected by up to 50% due to security issues. 75% of small and medium businesses were hit by at least one virus, with some affected over 100 times, 40% of respondents have been hit by hackers at least once, with some targeted more than 200 times, 29% don't use anti-spam software, 34% don't use spyware software, 4% don't use anti-virus software and 9% don't have Internet firewalls.