Every-time i download something from he internet my speed is somewhat 400 kbps to 700 kbps. I have a 1mbps net connection . Why am I not able to use entire net speed. Is this problem related to any hardware issues?
Your download speed is limited by a couple of things:
You are most likely limited by the server speed. Also, depending on your connection, your 1mbps is probably "max" speed. I.e. if all conditions are favorable. Heavy traffic on your ISPs network could drop that number.