What is the reason for the 'Quicken Error CC-501'?

[emilygriffin]

The reasons for 'Quicken Error CC-501' are detailed in the following summary. Downloads and installs of Quicken software may be inadequate. The data must have been corrupted by a virus that infiltrated the system. Unwanted garbage files are downloaded, slowing down the PC. It's possible that you're using an earlier version of Quicken. It's possible that you neglected to verify your bank credentials.
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Quicken error ol-393-a
Quicken Error OL--1-B