Hello priya and welcome to Seven Forums.
If I'm understanding you correctly, you mistakenly deleted your Windows 7 Home Premium. Is that correct? You should have a hidden recovery partition on your hard drive that can return your Vaio to factory specs. This Sony recovery guide should be very similar for your model. https://www.docs.sony.com/Release/VG...overyguide.pdf
If this doesn't work you can obtain a legal copy of Windows 7 Home Premium from here
. You would download the ISO file and save it to your desktop. Then burn the ISO file to a blank DVD. When finished you will have an installation disk.
You might be interested in this tutorial by one of the Forum members on how to do a clean install without all the factory bloatware. Clean Reinstall - Factory OEM Windows 7