Let's Encrypt certificates do not work on XP in IE8 or Chrome

@eva2000, I really appreciate your kindness and patience!
In my apache configuration I have the following set globally for mod_ssl (as in, at the top just after the ‘IfModule mod_ssl.c’ line and before any virtual hosts, with no other overrides in the virtualhosts)
SSLHonorCipherOrder on
SSLProtocol all -SSLv2 -SSLv3
SSLCipherSuite “EECDH+ECDSA+AESGCM EECDH+aRSA+AESGCM EECDH+ECDSA+SHA384 EECDH+ECDSA+SHA256 EECDH+aRSA+SHA384 EECDH+aRSA+SHA256 EECDH+aRSA+RC4 EECDH EDH+aRSA RC4 !aNULL !eNULL !LOW +3DES 3DES !MD5 !EXP !PSK !SRP !DSS !RC4”