Two solutions for the lack of space on the C drive after installing Win10

1. Use the disk management that comes with the system to get the D drive. The D disk first deletes the volume, and then the C disk expands the volume. Don't say that your D drive has no space, just throw the computer away.
2. Delete the windows.old file can save 10G. In addition, the space given by your C drive is too small, and the occupancy will continue to grow. If you don't optimize it, you can use it back to WIN7. How to delete the windows old file has a description.

In addition to getting some space from the D drive is to delete the old Window. If windows.old can be deleted to save 10G, this is a big number. Anyway, you should use Win10, the old one will be deleted, the old one will not go new, because the C disk space capacity is not allowed.