What should I do if the c drive space is insufficient after the win10 installation?

  
After the win10 installation, the lack of c drive space is generally due to the reason why the capacity is too small when installing the partition. Here, we will talk about the solution for you:
Control Panel---System and Security---Administrative Tools-- - Free disk space --- Default c drive --- OK --- Tick the deleted file --- Clean up the system file --- OK --- Delete the file for a while --- OK Ok

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