这类错误按照下面的办法来弄，一般会解决问题。
是因为以前安装过的程序残留了一些start menu，desktop相关的信息，删掉就可以了。
1. Find the install logs from this path:
(XP) - \Documents and Settings\All Users\Application Data\Microsoft\Microsoft Security Essentials\Support\msseInstall.log
(Vista/W7) - \ProgramData\Microsoft\Microsoft Security Essentials\Support\msseInstall.log
2. Open the log and search for "return value 3" and you will see the error just above the first result. See sample logs below. If you see the same items within the log, continue to the next step.
MSI (s) (CC:2C) [13:27:24:987]: Hello, I'm your 32bit Elevated custom action server.
MSI (s) (CC:E0) [13:27:25:283]: User policy value 'DisableRollback' is 0
MSI (s) (CC:E0) [13:27:25:283]: Machine policy value 'DisableRollback' is 0
Action ended 13:27:25: InstallFinalize. Return value 3.
3. Click Start then click Run
4. Give everyone permission to the desktop by typing the following command:
· CACLS “c:\documents and settings\all users\desktop” /t /g everyone:f
5. Give everyone permission to the Program menu by typing the following command:
· Vista/Win7: CACLS “C:\ProgramData\Microsoft\Windows\Start Menu\Programs” /t /g everyone:f
· XP: CACLS “C:\Documents and Settings\All Users\Start Menu\Programs” /t /g everyone:f
是因为以前安装过的程序残留了一些start menu，desktop相关的信息，删掉就可以了。
1. Find the install logs from this path:
(XP) - \Documents and Settings\All Users\Application Data\Microsoft\Microsoft Security Essentials\Support\msseInstall.log
(Vista/W7) - \ProgramData\Microsoft\Microsoft Security Essentials\Support\msseInstall.log
2. Open the log and search for "return value 3" and you will see the error just above the first result. See sample logs below. If you see the same items within the log, continue to the next step.
MSI (s) (CC:2C) [13:27:24:987]: Hello, I'm your 32bit Elevated custom action server.
MSI (s) (CC:E0) [13:27:25:283]: User policy value 'DisableRollback' is 0
MSI (s) (CC:E0) [13:27:25:283]: Machine policy value 'DisableRollback' is 0
Action ended 13:27:25: InstallFinalize. Return value 3.
3. Click Start then click Run
4. Give everyone permission to the desktop by typing the following command:
· CACLS “c:\documents and settings\all users\desktop” /t /g everyone:f
5. Give everyone permission to the Program menu by typing the following command:
· Vista/Win7: CACLS “C:\ProgramData\Microsoft\Windows\Start Menu\Programs” /t /g everyone:f
· XP: CACLS “C:\Documents and Settings\All Users\Start Menu\Programs” /t /g everyone:f
