Using CDs copied from the operating system to set up and maintain computers
Question

                I would like to open a shop for repairing computers. It is well known that there are copied disks for the operating system to be installed on the computers. Is it permissible to use these disks to install them on customers’ computers after setting them up? Is the money earned in return for that regarded as halaal or haraam?.
Praise be to Allah.It is not 
    permissible to make copies of disks without the permission of their authors, 
    because of copyright. This is a valid right and it is not permissible to 
    transgress it, in accordance with the conditions drawn up by both parties. 
It says in 
    the fatwas of the Standing Committee for Issuing Fatwas, led by Shaykh ‘Abd 
    al-‘Azeez ibn Baaz: It is not permissible to make copies of programs for 
    which the authors have not allowed copying, except with their permission, 
    because the Prophet  (peace and blessings of Allaah be upon him) said: 
    “Muslims are bound by their conditions.” And he  (peace and blessings of 
    Allaah be upon him) said: “A Muslims’ wealth is not permissible unless he 
    gives it willingly.” And he  (peace and blessings of Allaah be upon him) 
    said: “Whoever reaches a permissible thing first, he has more right to it.” 
    This applies whether the author of this program is a Muslim or a kaafir who 
    is not in a state of war with the Muslims, because the rights of a kaafir 
    who is not in state of war with the Muslims are to be respected like the 
    rights of a Muslim. And Allaah knows best. End quote from Fataawa 
    al-Lajnah al-Daa’imah. 
Shaykh 
    Muhammad ibn Saalih al-‘Uthaymeen (may Allaah have mercy on him) said the 
    following with regard to this matter: 
This is to 
    be based on what is known practice (al-‘urf). If a person wants to make a 
    copy for himself and the original author of the program did not state that 
    it is not allowed to make copies for personal or public use, then I hope 
    that there is nothing wrong with it, but if the original author of the 
    program stated that it is not allowed to make copies for personal or public 
    use, then it is not permitted at all. End quote. 
Based on 
    that, it is not permissible to copy the disks for operating systems etc, so 
    long as the author has not given permission for that. 
But if these 
    disks belong to a company in a state that is at war against the Muslims, 
    there is nothing wrong with copying them. 
And Allaah 
    knows best.