I would like to format my computer C drive , could you tell the procedure to carry

give step by step procedure

Why do you Want to format C Drive... in most of the pc C Drive is ur System Drive which contains all your software and applications... more over it is your bootable device as well..

If u want to reinstall operating system than Operating system in itself will provide you the option..
You can use Third party software like Disk Manager popularly known as DM and Partition Magic to format C: drive

if u can boot ur pc Via cd and Can open command prompt via cd.. than just type the following thing at command prompt
format c: