Cool, happy to see that somebody else is also trying to do that :-)
Well, I sometimes ran into trouble with virus scanning services or SMS services during install, but usually the problem disappears when I just stop the services.
With Mc Afee usually it should be sufficient to stop the On-Access scanner. Open the Virus Scan Console, that can be stopped there.
That guy can cause hanging systems anytime. Not only with database jobs, for me that appears also when accessing files with excel or other applications, also on network drives or internet browsing.
Imagine, he is scanning any file being accessed before allowing it to be read, so if you have anything as a network drive or few large tablespaces this can just let you hang.
For a Server I'd rather talk to the sysadmin guys to change the settings for the virus scanning to something different like scanning all disks every night.
Since on a Server usually browsing and stuff is not a dayly task (or should not be) it should not be a problem to switch off the on-access scanner.
For client PCs this argument might not apply, good luck then. If it is a regular job executed using CMD files, you could add some lines to stop and start the services if you have full admin rights.