"Network access denied" is just poorly worded message, that doesn't give you any specifics, meaning the connection your trying to make doesn't work. Could be bad URL, could be server(s) is/are down. could be website is just gone. Since others have just recently accessed the site you're looking for, we know the last potential problem is eliminated.
Computers, and the internet, working the way we expect is all about exactness based on electrical impulses that can often be less than exact. Look at how well our layouts work if we don't get the electrical stuff just right. My experience with most "tech" guys is that they are good at hooking up equipment and installing software and, maybe, fixing some major software glitches (usually by uninstalling and reinstalling the same software or just updating software to the most current version), but they may not be sophisticated enough to ferret out smaller, but no less important, issues. So, ask your "tech" guy if he considered these things:
1. Change your browser's DNS?
DNS stands for Domain Name Service which is a large group of servers offered by various internet providers that translates what we see as a website name (e.g. www.ogr.com) into a series of numbers and symbols that computers use to make the connection. Changing from the browser's "default" might even speed up your browsing.
2. Try typing the URL (www.glacierparkmodels.com) directly into your browser's address bar/search box?
If you are always connecting from a favorite/bookmark and the favorite/bookmark gets accidentally screwed up, you will never connect.
3. If he tried an uninstall/reinstall of your browser, did he "clear" all of your favorites/bookmarks, cache and website use history before that process?
I know this sounds drastic, but if the "error" was somehow in that stuff, uninstall/reinstall without those steps is purely an academic exercise.
Finally, your problem is not likely an incompatible or outdated operating system for your browser because then none of your connections would work. But, Windows 10 has built-in processes for checking its own health (if utilized) and making repairs as required (if asked). Be warned, however, that you should back-up your data before trying any of those processes.
Chuck
