Independently from your support request, you can tell Windows where to find specific dll's and executables by editing the PATH environment variable. Roughly (I'm using a french OS so items translation may use guesswork from you), here's the way:
Locate the wget application using Windows search. If this step fails you can forget about the method below :/
- Right-click on My Computer > Properties
Left pane, click Advanced System Settings
Down the popping window click Environment Variables
Seek for a variable called PATH (case sensitive) in either the user or system pool
Where you find it, edit the value; do not delete it's content. Make sure it is terminated by a semi-colon then append the path to the directory containing the wget application. Apply and close system windows, restart SU (or the system, to make sure).
If you can't seem to find such a variable, then you can consider creating it, in the user variables if the computer is shared or using various accounts, in the system variables if you want the modification to be considered in all cases.
The other well known alternative is to drop files into the system(32) folder but I do not recommend this for you, might as well screw something on the wget side.