Leo thinks it's most likely a hardware issue with the motherboard, RAM, or even power supply. Lynda will have to call Dell and get them to repair it, or take it to a local repair shop if there's one around.
It also could be that Lynda's hard drive is starting to die and it may be that it can't read the file it needs. Flakey hard drives are not all that unusual. Google has done a study and found that hard drives fail either right away or they work reliably and fail 4-5% every year.