I had the same issue while installing Windows Defender yesterday. Here is the
event I had at the time:
Event Type: Error
Event Source: Service Control Manager
Event Category: None
Event ID: 7023
Date: 04/13/2006
Time: 04:07:50 PM
User: N/A
Computer: 23NVCFW
Description:
The Windows Defender Service service terminated with the following error:
The system cannot find the file specified.
One trick that I did was to change the Log On in the properties of Windows
Defender Service to use my logon credentials instead of Local System. After
that when I tried to manually start the service the message I got was:
Event Type: Error
Event Source: Service Control Manager
Event Category: None
Event ID: 7023
Date: 04/14/2006
Time: 11:03:36 AM
User: N/A
Computer: 23NVCFW
Description:
The Windows Defender Service service terminated with the following error:
General access denied error
Finally I changed the Log On in properties back to Local System account and
after that I was able to manually start the service.
However every time I restarted the computer I had to go thru the same steps
to get the Windows Defender service running. I went back to the previous
build because of this issue.