Let's try this. Prepare the USB on your working computer. I am assuming the infected computer is 64-bit. If it doesn't work, let me know and we can try 32-bit.
Download the following three programmes to your desktop :
2. Windows 7 RC
3. Farbar Recovery Scan Tool
Extract wintoboot to your desktop
Insert a USB drive of at least 1GB
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.
It will make a log (FRST.txt) on the flash drive. Please copy and paste it to your reply.