Remove disk or any other media press any key to restart

Mar 16, 2018
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I was upgrading my pc to win 7 64 bit from 32 bit.
So i downloaded a iso folder and booted a pendrive.
Then when i rebooted my computer at first it work but showed that your system has started with the pendrive restart your system normally then upgrade it. So i restarted the pc and at the next time when i booted with my pendrive then after that it only shows that
Remove disks or any other media
Press any key to restart the computer.
Now i cant understand what changes i shoud make to make my sytem alright and upgrade my os
Please help me by giving what changes should i do in my booting system