If you deleted the partition with Red Hat which contained almost all the Grub bootloader files, there is no reason to expect it to boot. Also, you would obviously not see the Grub boot menu as you deleted it.
now at the start there are no keys displayed for BIOS and boot menu
BIOS options would be totally unrelated and you don't see the boot menu because you deleted it.
You indicate the windows 7 partition is OK, does that mean you can boot it? or have you viewed the partition from outside?
I'm not really understanding what you have here?