It may be you are having issues reading dvd on the notebook.
You could download Windows 7 iso from MS using
Windows 7
and then use rufus to write iso files to a usb stick.
Then change your bios settings to boot from usb stick and use that instead.
The above assumes you Windows 7 key is a retail (not oem) key.
Model is a Lenovo Thinkpad 030246G.
As the OS came with the notebook, I'm assuming the key is an OEM version.
You can get the iso from the following link (this site is well respected and I have never heard any suggestions that the isos are dodgy and I have used them myself without any problems).
Microsoft DigitalRiver Mirror
Note: it is important your key is the COA key as usually printed on a blue sticker on base of PC, not one previously extracted from registry (whilst Windows 7 was running) using a keyfinder.
It sounds like it is a problem with the DVD and the notebook. It might be a marginal DVD that other drives can read or it might be a defective DVD drive in the notebook.
Can the notebook boot from a USB flash drive? I would use ImgBurn to attempt to make a bootable ISO file from the DVD you have:
The Official ImgBurn Website
Then use Rufus to make a standard MBR bootable USB flash drive from the ISO:
Rufus - Create bootable USB drives the easy way
Then try booting the notebook from the USB flash drive, hopefully it has that capability.
I have not done this process myself...I really should try it sometime.
And yes, it is important to have the product key from the COA label on the notebook.
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