I contacted McAfee technical support but the problem seems to be with something ACCPAC is doing to the system.
I rebuild the machine, wiped o/s and reinstalled from start.
Installed McAfee, everthing works fine, no problems.
Installed Accpac, boom, service won't start up when I reboot.
Tried the option of restarting service if it fails, doesn't do anything.
Very strange, only thing I can think of is that accpac changes an o/s file somewhere that McAfee needs. Even after I unistall Accpac, McShield service will not start up unless I rebuild the machine again.