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I would need to know exactly what the error message is because "general error" is not something that PHP, Joomla, Admin Tools, or ever the web server would display. That's very likely your interpretation of what you're looking at which doesn't help me help you, hence me asking for the actual error message.

I’m afraid the summary you posted doesn’t give me anything I can actually work with. It describes a phone conversation with a third party about recovering your site, but it doesn’t answer the one question I asked: what is the exact wording of the error or message you saw on the screen?

I completely understand this is frustrating, but the quickest way for us to help you is if you reply to the specific questions we ask, in your own words and describing what you observe on your own site. A general summary of a separate conversation, however detailed, unfortunately doesn’t tell me what went wrong on your Joomla site or why.

That said, based on the little we have — a blank/white page appearing right after installing Admin Tools on a Hostgator server — there is a very common cause we can check straight away.

Admin Tools includes a feature called the .htaccess Maker. When it is used, it writes a brand new .htaccess file in your site’s root directory and keeps a backup of your previous one under the name .htaccess.admintools. On some hosts, including Hostgator, the original .htaccess contains special SetHandler or AddHandler lines that tell the server which PHP version to run your site with. If those lines are not present in the new file, the site can break with exactly the kind of blank page you describe.

So, the first thing I’d like you to try:

1. Using your hosting File Manager (or an FTP/SFTP client), go to your site’s root directory — the folder where Joomla’s configuration.php file is located. Please make sure your file manager is set to show hidden files, as names beginning with a dot (like .htaccess) are hidden by default.
2. If you see a file named .htaccess.admintools, first rename your current .htaccess file to something like .htaccess.bak, and then rename.htaccess.admintools back to .htaccess.
3. Visit your site again and let me know whether it now loads correctly.

If this fixes your site, we’re on the right track, and in my next reply I’ll show you exactly which lines from your original .htaccess need to be carried over so you can keep using Admin Tools safely. If it makes no difference — or if there is no.htaccess.admintools file at all — please tell me, and we’ll take the next step from there.