Just when you thought Vista's teething problems couldn't get worse, Microsoft have warned of yet more mayhem for users. If you use BitDefender Antivirus, Trend Micro Internet Security and several other minor security applications, then you may find they don't work when the next Vista service pack prompts you that it's time for an update. Microsoft have taken the unusual step of warning such users that the forthcoming SP1 update for Vista may actually stop certain security programs from working properly.

The update will be available in mid-March and will affect the programs in one of three ways either blocking them completely, disabling certain parts or not allowing them to run properly. Whatsmore, Microsoft are warning that there could be many other programs affected and the full casualty list will not be known for some time. Most of the applications that are expected to be hit are either niche Asian market products or specialist security packages that most English home users won't have. However, Softonic users that have installed BitDefender Antivirus and Trend Micro Internet Security will be affected. If you want to be on the safe side, there are many other alternatives available of which I would recommend Kaspersky Antivirus, Panda Antivirus or Avast!.

When the update is released, let us know if any of your programs are affected and we will do our best to suggest some useful or equivalent alternatives.