Try these solutions in order. Most users will succeed by step 3.
If none of the above works, you may have a (e.g., after replacing a motherboard or SSD). Contact Microsoft support with: Try these solutions in order
The error 0xc03f6601 is intimidating, but it is almost always solvable without reinstalling Windows. The core issue is almost always a . By thoroughly cleaning the licensing folder (Method 1) and reconfiguring via command line (Method 2), over 90% of users resolve the problem within 30 minutes. you may have a (e.g.