Installation error 0xc0070643

after many years without problem AVG free 'couldn't find licence number' and advised me to reinstall - this failed with error code 0xc0070643 telling me to contact 'our friendly support team'  .. so here I am.
Hello Mike,

You are most welcome.
We always impress our customers by giving quick response and providing 24/7 support.
Glad to know that your issue got resolved.
Thank you for following the instructions and posting back.
Please feel free to contact us should you need any assistance.
Have a great day!!!
Briiliant ... and impressed by the speedy response ...sorted - many thanks.
 

Briiliant … and impressed by the speedy response …sorted - many thanks.