[work] working with Canon 5D

I have an old Dell workstation.

I connected the 5D to the PC using USB.

I tried the slots on the back.

An error incured.
"No camera detected"
"not compatible"

I tried one slot in the front.
Failed again.
I reinstalled all the softwares.
Failed again.

I switched to another USB slot in the front.
There are totally two slots.

The error information changed.

I switched to using the EOS utility.

I succeeded!