I purchased the Cleared for Takeoff software Series. This consisted of 20 disks with lessons for flight school on each disk. I was able to use disk 1 to 6 but after lesson 6 the software kept telling me I had to be registered to use the software. I registered using my included registration code, also went to my flight school who confirmed I was registered in the system. I contacted King Schools directly and received a very unprofessional customer service experience. They Basically told me that it was not their job to aid customers and that I need to go to the flight school I was using and have them call tech support. I did this and was present when my flight school made the call. They received even worse service than I did. Tech support actually started screaming at them over the phone and told them that there was nothing they would do to help. They stated that it was not their problem once the software had been paid for. I paid over $500.00 for this software package and would expect better service than that for my money. John and Martha King need to get better control of their employees or just close down if they can't handle a business any better than this.