[Solved] Failed to open virtual machine

hi, not sure if this is relevent to this course. however, I try to upload the win 7 image and import it. came back with an error. failed to open virtual machine: system error:(unknown exception). Please and thank you.

Make sure the download has integrity. Either try downloading with another browser or download manager. Also use a good decompression tool if compresses. 7zip, peazip winrar etc.