After editing the registry, deleting the temporary files and clearing the cache we ran a Malwarebytes Scan which found and removed the files which were causing the Trojan virus to reappear.
]]>We find after examination that the antivirus has been disabled by a rootkit virus , malware and other Trojan viruses.
To resolve this we edited the registry and ran a Malwarebytes scan this removed the problems from the computer and gave us a position from which we could remove and reinstall the antivirus program.

Update: The Acer Aspire 5738 / 5338 laptop computer was repaired successfully, and as the machine was 2.5 years old it seemed prudent to change the CR2032 battery that holds the time date and CMOS information as they can last 3 to 5 years and normally would be inaccessible.
]]>Update: whilst here we also added Email accounts to another Apple iPhone, Apple iPad, Apple Macbook Pro and a laptop computer with Microsoft Windows 7.
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Update: We installed the email on their computer systems, Apple iPhones and Apple iPad, the Toshiba laptop computer needed TCP/IP and winsocks resetting, and a desktop computer needed 2 antivirus programs removing, this was causing the computer to run slower.
]]>Update : This malware was more trouble to remove than the previous version we had to run system restore and choose a date earlier than when the virus arrived, followed by a check on the registry and a full Malwarebytes scan.
Further Update : it turns out this arrived via an email claiming to be a Federal Express missed delivery and the customer had opened an attachment
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