DON'T BE POSITIVE!
Did I not sugar coat the truth just then? Well, i'm not sorry. People in business tend to see failure and make excuses for it. Don't. Accept the failure and either make improvements or make an exit strategy. Don't be blind and go down with the ship. There is no honor in it. There is honor in moving on or moving up- well, they really can be the same thing.
Have a sales person who isn't pulling his/her weight? Don't feel bad, feel lucky. Catch the problem and find a better sales person. Don't make excuses and try to remain positive. If sales have been lagging then the sales person isn't the right person for that job. Being too positive can hurt you in business. Be a realist. Be productive. Be honest with yourself and your employees!
Now, go be successful!