The soon-to-be released Windows Vista service pack may stop
some third-party programs working.
Microsoft is warning that the SP1 update for Windows Vista users may impact other programs that PC owners have installed on their machines.
The update is due in mid-March (or this month for business users) but Microsoft has opted to issue the warning now.
According to the BBC, most of the software hit by the upgrade are security programs.
The list of programs affected by SP1 is divided into three. Some will be blocked by the update, some will not run and others will lose some of their functions.
Microsoft has warned that its list was not "comprehensive" and asked people to get in touch with the maker of any affected software to fix problems.
Here's the list:
Fujitsu Shock Sensor
Jiangmin KV Antivirus 10
Jiangmin KV Antivirus 2008
Trend Micro Internet Security
Zone Alarm Security Suite
Iron Speed Designer
Rising Personal Firewall
Novell ZCM Agent