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Yes, you can delete all.
Yes you can Delete.
The AMD Folder is merely a Temporary Folder.
You can simply delete it.
I personally find it a good practise to use a USB Flash Drive to extract the Installer to, so that I always have "Ready to Go" Backups of each Driver in case there's a reason to Fall-Back to an older Chipset / Graphics / Audio Driver.
Specifically Latest Optional, Latest Recommended and Last Known Good Driver.