I just read a great article at the Neuroscience Marketing Blog about how bad websites increase stress levels.  Take a look at the article it’s a great read:  http://www.neurosciencemarketing.com/blog/articles/web-stress.htm

This really brings home the fact that you want a website that is going to simplify your potential client’s life, not complicate it.  Your business was established to provide a solution.  If you are creating more problems with your client through your bad website the client will be less likely to contact you for your services.