Take your time, get whatever rest you need.asked to choose a hard disk for the New mirtual machine.. tried to cvhoose existing C. that opened explorer. could not download. do not know what to do now. must trry to sleep now.
But, you are jumping ahead of me... I prefer that you "check your download" before you try to install it in VirtualBox. With Linux .iso files, it is really a good idea to always check them so you can be sure that they are not corrupted. The folks who make Linux Mint also provide a "checksum" file that shows SHA256 checksums (or "hashes"). I want you to download a small Windows utility that will verify that checksum when you run it.
So, download the following two files:
1. Click on this link and click the big green Download button to get the utility:
2. Right-click on this link and "save as" or "save link as" or whatever to get the Linux Mint checksums:
The checksum file has 8 different versions of Linux Mint 18.2 listed, but the only one you are interested in is for "linuxmint-18.2-mate-64bit.iso" if you followed my download link above. The utility should be pretty easy to figure out... run it, and first uncheck all the selections on the left except SHA-256 -- keep that checked. Then click the "Browse" button on the top line to locate the Linux Mint .iso file that you downloaded yesterday. When you click the .iso file, the utility will start generating the SHA-256 hash and it will only take a few moments to finish. Next, open the checksum text file and click-and-drag to highlight and copy the long string of gibberish characters that go with the "linuxmint-18.2-mate-64bit.iso" file. Stop highlighting at the end of the gibberish and do not get the ( * ) character that description that follows it. Copy your highlighted text and come back to the utility program and paste it into the bottom box marked "Hash:" and then click the Verify button below. The utility should pop up a small window telling your that the checksums match. If not, make sure you've followed all the steps and copied the correct string from the checksum file into the utility.
If the utility fails to match the checksums, that indicates a bad (corrupted) download. You never want to try to install a corrupted Linux... remember this is an operating system, so if it isn't perfect, your computer may not boot. (Well, you are safe using VirtualBox, but consider if you are replacing Windows instead... this is important stuff.) So if the checksum fails to verify, then you need to download the big Linux Mint .iso file again and then repeat the process of verifying it all over again. Hopefully you won't need to do that and your original download verifies fine.
Next step... we'll go over installing the .iso file into VirtualBox so you have a running Linux system. When you are successfully running Linux, we can bring this thread to a close since that meets your original goal. Then you can open a new thread about installing genealogy software in Linux and we'll pursue that further.