Easily fixed...
Reminds me of a customer at a place I used to work at.
A colleague got a call demanding that "It always goes wrong at the same point and someone needs to be here to fix it right away". As they were a big account and would not accept help over the phone, he gets in his car and makes the four hour drive to their site.
When he arrives, he's taken straight to the PC and shown the problem.
"See, I get to here, click the right mouse button as the manual says and nothing happens" says the customer.
"Right" says my colleague, "I can see what the problem is here. Do you have a marker pen"?
They go off and find one, and he is then able to put an "L" and and "R" on the mouse buttons and then make the four hour journey back to the office.