Add punctuation: When its deleted by Norton 360 the infected DLL file would be removed too
A: When it's deleted by Norton 360, the infected DLL file would be removed too.

Add punctuation: Check rates and availability for National Park Backparks Then proceed to booking
A: Check rates and availability for National Park Backparks. Then proceed to booking.

Add punctuation: The Open Directory has a policy against the inclusion of sites with illegal content Examples of illegal material include child pornography libel material that infringes any intellectual property right and material that specifically advocates solicits or abets illegal activity such as fraud or violence
A:
The Open Directory has a policy against the inclusion of sites with illegal content. Examples of illegal material include child pornography; libel; material that infringes any intellectual property right; and material that specifically advocates, solicits or abets illegal activity (such as fraud or violence).