WSH is installed by default.
To prevent scripts with a .VBS extension from being run:
1. Log on as an Administrator.
2. On the 'Desktop', or in 'Windows Explorer', right-click on 'My Computer'.
3. Select 'Open' from the menu.
4. In the 'My Computer' window, open the 'Tools' menu and select 'Folder Options'.
5. Open the 'File Types' tabbed page.
6. Look for 'VBScript Script File' in the list of file types (if you can't find it, your machine is safe and you don't need to do anything else).
7. Click on the 'Delete' button.
8. If you see a dialog asking you to confirm removal, click 'Yes'.