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Its probably because VMware Authorization service is not running. To start the VMware Authorization service or to check whether it's running: Login to the Windows operating system as the Administrator. Click Start and then type Run. If you are unable to find the Run option, refer to Microsoft article What happened to the Run command? Type services.msc and ...

I started the VMware Player in Administrator Mode and it worked.

right click on the App. and Run as admin. OR from run type services.msc and run VMware Authorization Service

If you're just trying to use the so-called CS50 appliance you don't need VMWare Workstation. Such software is a more complex piece of software designed to create and admin virtual machines. What you (probably) need is VMWare Player v6.0.4. Newest version is v7.0, but it's only offered "for Windows 64-bit operating systems".

I restarted my computer and it worked!

I am using the Appliance on Ubuntu 14.04. Initially I tried VMware and ran through lots of trouble, but then I used VirtualBox (which I had previously installed,) and everything worked fine. After removing VMware (with VirtualBox installed,) I just double clicked the Appliance's OVA file, and it got installed. At the end of the VirtualBox tutorial for Linux ...

New approach: I googled your error ("Google is your friend":) and found these two potentially useful answers: Answer 1 - VMWware Community Answer 2 - SuperUser HTH!

Yes, you must open VMware Player to run any virtual machine, including the cs50 appliance. If you are looking for a Dropbox folder on your computer, outside of the virtual machine, make sure you have installed Dropbox in both places - on your computer, and inside the virtual machine - separately.

You might have an corrupted download issue.. try downloading the appliance again.

It looks to me as though the installation file you downloaded may have been corrupt. The common way to verify the integrity of downloaded files is by calculating a checksum and comparing it to the checksum provided on the download page. In this case, there are two checksums on the VMware Player download page corresponding to the currently-available Windows ...

I tried the above suggested, but VMware never told me the error specifically. Oracle Virtualbox told me that the .ova file was corrupted, so I re-downloaded that file, and now the appliance works just fine.

First of all check if the VM Ware Player is 64-bit compatible. The make command is for compiling C programs. You have to use mkdir for creating directories. Secondly you don't create the Dropbox folder, it automatically gets created for you. Just click on the CS50 "Start" button, click on Dropbox, and follow the instructions. To make the Pset1 folder ...