Unfortunately you’ve been scammed. Did they ask you to open event viewer & show you the ‘errors’ as proof of a problem? This what these people usually do.
You have to assume that all your passwords have been compromised & that these people have access to your bank details & credit/debit cards. Did they ask you to install any software? If so I would uninstall this immediately using Revo Uninstaller: https://www.revouninstaller.com/products/revo-uninstaller-free/ Also scan your PC for malware: