Hello, everyone. My name is Emily Griffin. I work as a customer support executive in the IT industry. I have a huge amount of expertise working with many types of software; especially, Quicken Many people have contacted me with regards to the Quicken error cc-501. The error is caused by an unfinished Quicken installation. An assault by a virus or malware. Unwanted trash files slow down the performance of your computer. Using an outdated version of Quicken.