Sure, firstly you need to worry a lot as Quicken error cc-800 is commonly faced by most of the Quicken users. It can arise when your Quicken app is not updated properly. So the best way to fix this issue is to confirm that you are using the latest Quicken release. Follow the steps given below to do that-
Open Quicken on your system
Click on Tools and select the ‘One Step Update’ option
You can also choose to go to the ‘Help’ menu and Check for Updates in newer versions.
If the updates are found, click Update Now.
Once the update is successful, check if the issue persists. If it does connect with the Quicken support team for instant solution.