I have tried uninstalling it and have searched other answers. None of them have worked; IDLE opens, but I can't run anything I write.
If you at the network environment then check on the secure Group (SG), to see if the user is listed under that group.
else as other had been suggested you have to have the (right click on the program the login as Admin right to enable the IDLE to run.
IDLE's subprocess didn't make a connection. Either IDLE can't start or personal firewall software is blocking connection