AVG on XP m/c blocks Win10

Hi
Have Win XP and Win10 desktops connected by Gig NIC's into a 10/100 switch.
Both run AVG
Both on same WORKGROUP
With AVG running on the XP m/c the win10 cannot ping the XP or connect the shares on it although the XP machine shows under network in explorer on the win10  but the win10 cannot connect to it.
Stop AVG on the XP m/c and all works well.
XP is Sp3 and Win10 is 21H1
What changes to I have to make to AVG and on which (or both??) machines?

Hello John,

We sincerely apologize for the delay.
In this case, we request you to temporarily disable the individual shields/components of your AVG Internet Security & check which shield/component is causing the issue.
Refer to this article to temporarily disable the individual shields/components of your AVG Internet Security.
Keep us updated.