The reason you see "Blue Coat K9 Not Responding" after disabling the start up services is because K9 recognizes this as an unauthorized attempt to bypass K9. This is by design to prevent kids who are smarter than their parents from getting around K9.
There is no direct way to disable K9 without uninstalling it altogether. You can, however, use "Supervisor Mode" to access any site you would like for a pre-determined amount of time (up to 1 hour). You can activate Supervisor Mode by opening your K9 administration page, selecting Setup and navigating to "Advanced" on the left hand navigation. At the bottom right, there should be an option for "Enter Supervisor Mode" and a drop-down menu to select the amount of time you would like to have unfiltered access. Select "Save" when finished.
If you have any problems with supervisor mode or any other K9 questions, I recommend contacting K9 support directly by using Instant Support found at http://www2.nohold.net/noHoldCust31/Prod_16/KnowledgePortal/KPScripts//frameskp.asp?sid=162618&ds=nh21.nohold.net
After the third question, the answer should provide a link "Click Here to Email Support". This will redirect you to the K9 support form where you can submit your request for assistance.
Hope this helps!