Richard recently bought a Google Nexus 7 and he's having trouble with the touch screen. Leo says that Google has acknowledged the problem and is working to push an update to Android that will solve the issue. He can also just return it and get one that doesn't have the issue. He shouldn't have to wait for an update and it could be a hardware problem. No software patch can fix that.
Google does mention resetting the tablet or booting the tablet into "Safe Mode".