OK could you use another computer to create the bootable USB
Download the following three programmes to your desktop :
1.
WiNTBootIc2.
Windows 7 64bit RC3.
Farbar Recovery Scan Tool x64 Extract wintoboot to your desktop
Insert a USB drive of at least 1GB
Run Wintoboot

Drag and drop the Windows 7 ISO to the programme in the space indicated
Tick the Format box and accept the warnings
Press Do It
You will see it progressing

It will let you know when it is done
Then copy FRST to the same USB
Insert the USB into the sick computer and start the computer. First ensuring that the system is set to boot from USB
Note: If you are not sure how to do that follow the instructions
Here When you reboot you will see this although yours will say windows 7.
Click repair my computer
Select your operating system
Select Command prompt
At the command prompt type the following :
notepad and press
Enter.
The notepad opens. Under File menu select
Open.
Select "Computer" and find your flash drive letter and close the notepad.
In the command window type
e:\frst64.exe and press
Enter Note: Replace letter
e with the drive letter of your flash drive.
The tool will start to run.
When the tool opens click Yes to disclaimer.

Press
Scan button.
It will make a log (FRST.txt) on the flash drive. Please copy and paste it to your reply.