That’s pity man but it seems your flash memory stick was/is not ok…
Do you have another Windows 7 disk from Microsoft?
In such case you could use such disk to create an bootable USB flash memory stick and you could install genuine Win 7 system using such USB stick.
The missing drivers could be downloaded from Toshiba driver page:
You should firstly burn/create and ISO image from Win 7 DVD. To do that you can use an tool called ImgBurn.
Now you should use the Windows 7 USB/DVD download tool to create a bootable USB memory stick to get the Win 7 installed.
Check
THIS