As far as can read, the sentence "We fix computers for..." could be understood as they work for a company. Thus, a suitable translation into Spanish would be:
Nos dedicamos a la reparación de computadoras / ordenadores para (X compañía)
You could say, more literally: " arreglamos computadoras para (X compañía)" or "reparamos computadoras para (X compañía)".
computer in Spanish is ordenador -- la computadora
tu arreglaste mi vida
informática
ratón...
computadora
To say 'I want a computer' in Spanish, you would say 'Yo quiero una computadora.'
"Log off the computer" in Spanish is "Salir de la sesion de computadora"
You can say: "Manuel està usando la computadora." which translates to "Manuel is using the computer."
Usar la computadora
Reparacion de computadoras
It can be "programador" or "programadora" for a female.
You could say "¿puedo usar tu computadora?"