Hi David,
I understand your Asus computer only loads https websites and will not load http websites. We will make sure the problem is fixed before that let’s start with few questions to get a clear picture of the issue.
1. What is the complete error message that he receives when he tries to access the website?
2. Are you using the Desktop Internet Explorer or the Modern UI Internet Explorer?
You can follow the below troubleshooting to fix the problem
You can reset Internet Explorer settings to return them to the state they were in when Internet Explorer was first installed on your PC. This can be useful for troubleshooting problems that might be caused by settings changed after installation.
Reset Internet Explorer settings:
http://windows.microsoft.com/en-in/internet-explorer/reset-ie-settings#ie=ie-11
Disclaimer: The Reset Internet Explorer Settings feature might reset security settings or privacy settings that you added to the list of Trusted Sites. The Reset Internet Explorer Settings feature might also reset parental control settings. We recommend that you note these sites before you use the Reset Internet Explorer Settings feature. Resetting Internet Explorer isn't reversible, and all previous settings are lost after reset.
Please revert back to us in case of any problems.