Real-time protection is enabled in settings, but fails to turn on:

Error when I try and start it:

System Center Endpoint Protection coun't turn on real-time protection.  This operation returned because the timeout period expired. Error code: 0x800705b4

Hi

Please make sure that all other real-time antimalware products are removed and Windows Defender is disabled.

• Marked as answer by Joyce LMicrosoft contingent staff, Moderator Tuesday, October 22, 2013 1:13 PM
• Unmarked as answer by DP000 Tuesday, October 22, 2013 6:53 PM

No other antimailware products are installed.  Forefront was installed at one time, but was removed when Endpoint was installed.  There is only one instance of MsMpEng.exe running.

Hi, 

Based on your description, this might happen when the previous forefront files are not being completely uninstalled from the computer. 

Another important aspect for troubleshooting is to look into computer registry. You need to clean the residual records of previous forefront.

Also, you should install a new .NET framework. If the current version does not work after repairing, you need to download the latest one on Microsoft official website and install it on your computer.

I went through the registry and deleted most of the forefront records, but a few of them won't let me delete them (Error while deleting key), I tried in safemode as well:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Forefront

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_FCSAM

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet003\Enum\Root\LEGACY_FCSAM

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_FCSAM

I also instsalled .NET 4, but still no luck.

Yes, I know this is an old post, but Im trying to clean them up. Did you solve this problem, if so what was the solution?

Since no one has answer this post, I recommend opening  a support case with Microsoft Customer Support Services (CSS) as they can work with you to solve this problem.