I am not sure that this post belongs under General Questions as it might better be put under Installation. I just am not sure. I have Windows 8.1 installed on my system with the .pvm file stored on an external usb 3 (very fast) ssd. The other day, when running some Windows software, the system asked me if I wanted to install Windows 10. I said OK, but then paused it as I had other things to do and did not want the download taking up my bandwidth. Well, it installed it anyway and placed it on my main ssd. I noticed it this morning and tried to run the VM. It seemed to run, but nothing really seems to work. I started the 10 version of IE (Edge?), it connected to the website I wanted but then froze. Recovering the web page worked, but then it froze. I shut down the VM and restarted it, but got the same results. I copied the .pvm file to my external ssd, as I was able to do with my Windows 8.1 pvm file, but then nothing worked at all and the Parallels Desktop showed Windows 10 with a big ? I want to remove it and redo the Windows 10 installation, but do not know how. I can move the pvm file to the Trash but suspect that since Parallels knows that it has installed Windows 10 it will not try again. Is there any way for me to remove the 10 installation and be able to redo the installation? I know I can restore my system to before all of this happened, but that seems excessive.