win7 上 vagrant 无法启动，请各位帮忙看看

今天在win7 上安装vagrant 1.7.2, vbox 4.3.26 。使用vagrant up 之后，报如下错误：
D:\vagrant>vagrant up
Bringing machine 'default' up with 'virtualbox' provider...
==> default: Importing base box 'base'...
C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/providers/virtualb
ox/driver/base.rb:387:in `gsub': invalid byte sequence in UTF-8 (ArgumentError)
from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/provi
ders/virtualbox/driver/base.rb:387:in `execute'
from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/provi
ders/virtualbox/driver/version_4_3.rb:172:in `import'
from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/provi
ders/virtualbox/action/import.rb:15:in `call'
from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/a
ction/warden.rb:34:in `call'
from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/provi
ders/virtualbox/action/customize.rb:40:in `call'
from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/a
ction/warden.rb:34:in `call'


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