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engine - 6:10 pm on Feb 21, 2008 (gmt 0)
Microsoft blocks these programs from starting after SP1 is loaded. Some of the programs include: BitDefender AV, Trend Micro Internet Security Some of the programs that lose functionality after SP1 installation include: NYT reader and Novell ZCM Agent. KB935796 indicates that most of the solutions and information is availble from the vendors' sites. KB935796 [support.microsoft.com]
Microsoft has published a list of programs affected by Vista SP1.