Error 0x8004fc12 usually occurs with a clean install. This error means that windows cannot activate; it can be due to one of the following reasons:
a) the activation servers are busy
b) no internet connectivity
c) an update from windows is pending.
In order to fix the issue; make sure your system has internet and there are no issues with router. If internet’s working, you can then reboot your PC, check for updates and then activate it.
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