The list of 12 products -- divided into categories of "blocked from starting," "do not run" and "loss of functionality (minor or major)" -- is based on reported issues and is "not comprehensive," the company said. Many of the affected programs offer newer versions or upgrades that will make the software compatible (linked below where applicable).

As of press time, the products are:

Blocked from Starting

• BitDefender AV or Internet Security, version 10
• Fujitsu Shock Sensor 2.1.0.0
• Jiangmin KV Antivirus 10
• Jiangmin KV Antivirus 2008
• Trend Micro Internet Security 2008
• ZoneAlarm Security Suite 7.1

Do Not Run

• Iron Speed Designer 5.0.1
• Xheo Licensing 3.1
• FreeAllegiance 2.1

Loss of Functionality

• NYT Reader
• Rising Personal Firewall 2007
• Novell ZCM Agent 10.01

As Vista SP1 was released to manufacturing and IT professionals this month, the list may grow -- especially after the update goes live for consumers in March.

Becky Nagel is the executive editor of the 1105 Redmond Media Group's Web sites, including Redmondmag.com, RCPmag.com, RedDevNews.com and VisualStudioMagazine.com, among others.