If you haven't rebooted Windows since you installed the latest software update, please do so now and then try Quicken again.
Still not working?
Let's do some "Troubleshooting 101" to ensure the Quicken software is installed and updated properly and that your data file is in good working order. Crashes or killing Quicken may damage the file. Please perform all the steps in this document in the order specified, even if you have done some of them before:
Advanced Data File Troubleshooting to Correct Problems With Quicken for Windows