Most often Windows however it could be a variation of linux
windows xp
AnswerAssuming you're like the 99% who are using PCs or MACs: An operating system resides on your local computer and it's function is to allow the software to work with the hardware on that machine. A network operating system allows multiple computers to connect to each other, controlling the sharing of devices, files or programs. This resides on a shared computer called a "server".
The operating system resides in secondary memory i.e., hard disk.when we boot our computer it is loaded into Primary memory i.e.,RAM and then loaded,this process is called booting
Operating system is obviously resides in computer memory which is hard disk. But the main (booting) files are loaded into ROM by bootstrap loader at the time of start of the computer. Have you ever seen your C drive (or the drive which is for system, program files). This drive is on hard disk ... so OPERATING SYSTEM PLACED MAINLY ON HARD DISK...
An operating system is software that resides between user applications and hardware. It's job is to manage hardware resources and allocate them to the user applications through processes such as memory management and process scheduling.
A ROM chip
Please rephrase question. Are you trying to ask how to erase files from your computer? If so, which operating system?
A computer without an operating system will not operate.
The computer is running on the Windows operating system.
ROM
operating system decide what your computer will do
utility program