Sudo not found. Trying npm install

I am using a Windows 8.1 laptop. I keep getting sudo not found. Trying npm install with the following command:

F:\Webruin2>sudo npm install -g git
'sudo' is not recognized as an internal or external command,
operable program or batch file.

F:\Webruin2>npm install -g git
git@0.1.5 C:\Users\Dave\AppData\Roaming\npm\node_modules\git
└── mime@1.2.9

F:\Webruin2>git -v
'git' is not recognized as an internal or external command,
operable program or batch file.

F:\Webruin2>npm install -s sudo
sudo@1.0.3 node_modules\sudo
├── inpath@1.0.2
├── pidof@1.0.2
└── read@1.0.5 (mute-stream@0.0.4)

F:\Webruin2>sudo npm install -g git
'sudo' is not recognized as an internal or external command,
operable program or batch file.

Please let me know the best way to proceed. If this is off topic, please help me get it back on topic. ;)

Tim