How are you setting up this deployment?
You said that when you use Deploy Agents the installations worked fine. What other method are you using?
Do you have the Installation log file for these systems?
It's under %Temp%\McAfeeLogs\FrmInst.log
I just go in and create a client task using the current branch of the agent which is 220.127.116.112. Then from the System Tree I select a machine or multiple machines and select the button called "Run Client Task Now". I then select the task I created. I've seen this fail every time but one and that was on a 2008 R2 machine. It has failed so far on all XP machines, 2003 and other 2008 R2 machines. I can't see anything in the logs other than below on some machines that looks like an error.
The Deploy Agents method via the System Tree always works.
I found this in the log
2011-11-22 15:57:55 E #6772 Xml cfg Error trace:
2011-11-22 15:57:55 E #6772 Thread cfg [Main thread]->
2011-11-22 15:57:55 E #6772 Xml cfg [useExistingFile,C:\ProgramData\McAfee\Common Framework\Server.xml]->
2011-11-22 15:57:55 E #6772 Xml cfg [ReadBufferFromFileNoExp,C:\ProgramData\McAfee\Common Framework\Server.xml]->
2011-11-22 15:57:55 E #6772 Xml cfg Couldn't open to read: No such file or directory
2011-11-22 15:57:55 I #6772 Thread cfg Exit program
Try to assign this task you created to run on every policy enforcement and set the schedule to Run Immediatly.
I'm not very familiar with Run Task Now configuration.
I'll try it on my 2008 R2 machines.