Many people are unaware of the many problems the industry has to face. Even the top antivirus software may have issues. While some issues are minor and can be dealt with quickly, some are more serious.
One of the biggest problems is that the virus-signature protection does not cover a wide variety of threats. It takes antivirus companies a long time to check this release antivirus updates after new viruses are discovered. This is because they have to wait until their products are able to detect the virus and then send it to be analysed.
In the meantime the virus is bound to spread and it’s quite likely that hundreds or dozens of computers will be affected by the virus. It may also spread to other networks. To be efficient, anti-virus software must to be able to detect and stop these infections quickly. This means that behaviour blocking or heuristic analysis tools are more effective than signature detection.
Another problem is that incompatibility between different antivirus programs is quite frequent. While the majority of antivirus software makers focus on creating quality products and removing bugs it is true that multiple antivirus programs may sometimes cause conflicts.