why everytime the computer will install the operation system in C disk?

The reason your C drive is small is because your partition to that drive is small. I would suggest setting up new partitions upon setup so that you can allocate drive space to what is needed. you can also specify where the OS is installed. usually you will need two drive allocations, one big and one small. The big drive allocation is for the main OS and the second partition is for things like system restore files or back up files. You can also set up third partitions for separate OS load-ups.

You can choose the disk that the OS installs on, but the default label is C. I think you can change the label somehow, but it won't give you more disk space. Are you sure you chose the right disk? When the OS installs, it may take up some room on the disk. (my vista install took away about 10-20gb) Maybe that is what is confusing you.

Because an OS always defaults to C drive when the user doesn't select a different drive. I don't know where you get the idea that C drive is always the smallest here. Maybe yours is, mine isn't. I suggest you invest in a basic computer course.

as you boot press the delete key once you get to the bios window seek for the boot suggestions substitute them besides to cd/rom press F10 then the enter key placed win cd in force whilst asked besides from cd press any key faucet the gap bar then examine the show screen as you flow whilst asked the place to os pick c: press c to settle for then f to format this force

Sound like an id_10_t error to me.