Your company, ABC Reading, writes unique Open GL based reading software for children in grade school. ABC employs about 30 sales representatives who interact with school districts around the nation to sell and support your software. ABC has given each sales representative a powerful laptop on which to demonstrate your 3D software to principals and district representatives. Because of the nature of their jobs, sales reps are constantly connecting their laptops to school and hotel networks during the day and to your corporate network via VPN. You are worried about viruses and worms entering your corporate network through one of their laptops. What protections and preventions would you take to guard against this?