Lightroom 5.7 won't Import. I get this message: The instruction at 0x17f3f885 referenced memory at ... Memory could not be read. This program has been flawless for the past 3 weeks.
You really need to provide a little more information such as operating system, memory etc.
Typically a error like this is happening because a background process is executing and interfering with available RAM, not enough virtual memory (Windows), out of date HW drivers or just a incomplete install.
Or, one of the biggest problems is add-ons in internet browsers.
Or, another Lightroom problem, insufficient permissions on the directory where you are importing image files to.
Please provide a little more info.