Error # DT00X2 is a fake alert, which is a fake Microsoft Warning. This is the pop-up that contains elements of ransomware. It attacks Windows PCs only. Here is the quotation from it:
Microsoft Windows Warning
Your Computer Was Locked
Error # DT00X2
Call Microsoft Technical Support:
Do Not Ignore This Important Warning…
If you close this page without resolving issue, access to your computer will be disabled to prevent further damage to our network. Your computer has alerted us that it was infected with virus and spyware.
The following data is at risk:
Credit Card Information
Browsing History and Data
You must contact us immediately so our engineers can guide you through the recovery process by phone. Please call us within the next 5 minutes to prevent complete loss of your computer.
Call Microsoft Technical Support
Detailed removal guide here - https://trojan-killer.net/remove-error-dt00x2/