I know nothing of Mcafee.
To slipstream am MSP into an MSI .... use this syntax:
QUOTE
msiexec /p [path\name of update MSP file]/a [path\name of MSI file] SHORTFILENAMES=TRUE /qb /L* [path\name of log file]
example:
QUOTE
msiexec /p OUTLFLTR.msp /a d:\office\pro11.msi SHORTFILENAMES=TRUE /qb /l* install.log
The following describes the command-line options.
/p Enables Windows Installer to apply an update to an existing installation.
/a Enables Windows Installer to perform an administrative installation of a product on a network share.
SHORTFILENAMES=TRUE Directs Windows Installer to create all file names and folders with
MS-DOS-compatible file names. Required when you run Windows Installer from the command line.
/qb Sets the user interface to the basic level (simple progress and error handling).
/L* Turns on logging and sets a path for the log file. The * flag causes the switch to log all information.
shark