How to clear boot data

How to clear boot data

Recently I bought laptop,While Windows 7 istalization time battery was
died.So I plug-in charger and re-installed windows 7 home basic from
starting.after completion of procedure.I have 2 windows folders in my C
drive,so I deleted old windows folder.
The problem is, While booting time it showing 2 windows 7 options.Already
I deleted old Windows folder.Still It showing 2 Windows 7 options while
booting time.How can I remove old Windows 7 option from my boot.
I hope, you guys understand what I am saying.
Thanks.