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#21
The error message is a result of ZeroAccess disabling Microsoft Security Essentials and/or Windows Defender by placing a Reparse Point (Junction/Symbolic Link) on the files of these products.
Please use HitmanPro 64-bit version.
Downlaod > HitmanPro Download
Save to the Desktop
Double-click the downloaded file to start the program.
When HitmanPro starts, follow the prompts and click Next to scan for malicious software.
Accept the license agreement to run the program.
In the Setup prompt, select the option to do a one time scan. Uncheck everything else, and press: Next
When it finishes it will display a list of the Identified Threats (malware) or other entries found (i.e. cookies, PUPs, etc.).
Click on the Next button and select the option: Activate Free License
This begins the free 30 days trial, and removes all the Identified files from the computer.
After the entries are removed, click on the Save Log option.
Save the HitmanPro log to the Desktop.
Now, close the program, and restart the computer.
Try installing MSE once again, let us know what happens, and please post the content of the HitmanPro log in your reply.