1. Download Windows binaries of wget.
2. Extract it to to say D:\Utils\ (you can put it where ever you want).
3. Right-click Computer under the start menu and choose Properties.
4. On the left pane click Advanced System Settings and choose Environment Variables.
5. In the 'User Variables' section (the upper part), create new variable named Path if it doesn't exist.
6. For that click the New button, give the name value Path and variable value the location of the wget folder. In our case its D:\Utils
But if the Path variable is already present, add a semi-colon at the end and then specify the location of wget.exe.