Here's the full text of the command and the error. Note that the "Greg-Intermaggio-X1-Greg-Intermaggio" directory doesn't exist in "C:\ProgramData/HashiCorp/VagrantVMware/"-- the only thing there is the "GREG-INTERMAGGI-Greg Intermaggio" directory, which has a UserData directory but appears to be missing the helper.args file, and which may be missing additional files (I don't know what to look for).
C:\WINDOWS\system32>vagrant box add laravel/homestead
C:/Users/Greg Intermaggio/.vagrant.d/gems/2.3.4/gems/vagrant-vmware-workstation-5.0.1/lib/vagrant-vmware-workstation/sudo_helper.rb:156:in `initialize': No such file or directory @ rb_sysopen - C:\ProgramData/HashiCorp/VagrantVMware/Greg-Intermaggio-X1-Greg Intermaggio/UserData/helper.args (Errno::ENOENT)
from C:/Users/Greg Intermaggio/.vagrant.d/gems/2.3.4/gems/vagrant-vmware-workstation-5.0.1/lib/vagrant-vmware-workstation/sudo_helper.rb:156:in `open'
from C:/Users/Greg Intermaggio/.vagrant.d/gems/2.3.4/gems/vagrant-vmware-workstation-5.0.1/lib/vagrant-vmware-workstation/sudo_helper.rb:156:in `with_args_file'
from C:/Users/Greg Intermaggio/.vagrant.d/gems/2.3.4/gems/vagrant-vmware-workstation-5.0.1/lib/vagrant-vmware-workstation/sudo_helper.rb:115:in `execute'
from C:/Users/Greg Intermaggio/.vagrant.d/gems/2.3.4/gems/vagrant-vmware-workstation-5.0.1/lib/vagrant-vmware-workstation/sudo_helper.rb:103:in `call'
from C:/Users/Greg Intermaggio/.vagrant.d/gems/2.3.4/gems/vagrant-vmware-workstation-5.0.1/lib/vagrant-vmware-workstation/sudo_helper.rb:39:in `call'
from C:/Users/Greg Intermaggio/.vagrant.d/gems/2.3.4/gems/vagrant-vmware-workstation-5.0.1/lib/vagrant-vmware-workstation/sudo_helper.rb:77:in `installed?'
from C:/Users/Greg Intermaggio/.vagrant.d/gems/2.3.4/gems/vagrant-vmware-workstation-5.0.1/lib/vagrant-vmware-workstation/plugin.rb:28:in `call'
from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-2.0.0/lib/vagrant/action/warden.rb:34:in `call'
from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-2.0.0/lib/vagrant/action/builder.rb:116:in `call'
from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-2.0.0/lib/vagrant/action/runner.rb:66:in `block in run'
from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-2.0.0/lib/vagrant/util/busy.rb:19:in `busy'
from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-2.0.0/lib/vagrant/action/runner.rb:66:in `run'
from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-2.0.0/lib/vagrant/environment.rb:543:in `hook'
from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-2.0.0/lib/vagrant/environment.rb:194:in `initialize'
from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-2.0.0/bin/vagrant:118:in `new'
from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-2.0.0/bin/vagrant:118:in `<main>'