After Anu handed you the USB stick you should fill it with data from Prune HQ.
This is the low-spoiler guide for "Stealing information from Prune for Anu" puzzle in Leisure Suit Larry - Wet Dreams Don't Dry. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.