Bootcamp drivers Error - Key Agent

Hi All,
I have recently reinstalled fresh Bootcamp (Windows 7 x64) on my iMac running Yosemite. However I'm having difficulty installing the drivers, I had to first bypass the issue with the x64bit drivers but running it through CMD but I get the Errors
"Service 'Key Agent/Mac HAL' (Keyagent/MacHALDrivers) failed to start. Verify that you have sufficient privileges to start system services."
I have tried following the instructions that seemed to be the answer for this:
I had the exact same problem, only on a 17" MBP. In my case, Win7 event manager reported that BootCamp 3.2 Services failed to install, in particular the KeyAgent service (and without that you get no Apple keyboard and functions and apparently the BootCamp icon doesn't show up in the system tray).
Event Manager said the BootCamp installer did not have sufficient permissions, so I went to dial down the User Account Control (UAC) settings (in fact, I turned it off). What I should have seen when BootCamp 3.2 update was running was a window to ask my permission to continue (allow the software to install). Instead, there was a silent failure.
OK, so by turning off UAC that gives it permission in advance (you have to reboot after changing the UAC settings in order to ensure that it is truly OFF). After rebooting, I went to Programs and Features and found BootCamp Services as a software item. I selected "Repair" and after another reboot, I was back in business! Keyboard is now fine (including the disk eject button, which I wanted working). Then I went back to turn on UAC to its default level (one notch below highest setting). It is useful (normally) to have this on.
Ask the Windows Help system if you don't know how to find the UAC settings to give this a try. Hope it helps you.
I have followed these instructions, tried on all different UAC settings, (including resets) and by running repairs on the program in Programs and Features and but rerunning it in CMD but the same evil error keeps getting in my way.
Anyone had and solved this issue recently? Can you install these drivers another way?
Regards.

You should post your question in the Boot Camp forums:
http://discussions.apple.com/category.jspa?categoryID=237

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    INFO | jvm 1 | 2009/11/24 15:52:03 | INFO [Messenger] Got queue queue/AgentPoolNotificationQueue
    INFO | jvm 1 | 2009/11/24 15:52:03 | INFO [Messenger] Created queue connection.
    INFO | jvm 1 | 2009/11/24 15:52:03 | INFO [Messenger] Created queue session.
    INFO | jvm 1 | 2009/11/24 15:52:03 | INFO [Messenger] Connected to server=x33620:1099 queue=queue/AgentPoolNotificationQueue
    INFO | jvm 1 | 2009/11/24 15:52:03 | INFO [Request] [Host:x33620;Port:1099;Requestor ID:null;Requestor Key:JBOSS-x33620-1099;Requestor Queue:queue/AgentPoolNotificationQueue;Request ID:131;Request:stopagent;] - authentication successfull
    INFO | jvm 1 | 2009/11/24 15:52:03 | ERROR [EmpStartMain] Unknown agent ID: agId12902_rnd1409932225
    So it looks as though the memory is OK, however, for some reason half-way through the test the agent ID becomes unknown. This error is the same across all the agents.
    Thanks in advance,
    Michael

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