How to reload avast usb rescue disk to boot up Win7 machine

I am trying to find how to reload my AVASTUSB rescue disk.

I made the mistake of originally creating the USB rescue disk on my infected computer instead of going to a non-infected computer to get and set up my free AVAST2015 virus protection. I don’t see any where to be able to do this reload function. I have a brand new USB ready to create another USB Rescue Disk. My Win7 machine now won’t reboot at all and I believe the boot up section is infected and comprised.Need help fast. Thanks.

The rescue disk is not for restoring a system, it is for troubleshooting and if possible disinfecting/repairing things.
It is also not for installing avast.
To use it, you need to boot from it.
This can mean you need to change the boot order in the bios first.

http://www.avast.com/faq.php?article=AVKB114

You may want to follow these instructions:
https://forum.avast.com/index.php?topic=53253.0

Hold on. I will get someone with specific instructions for you

Is it 32 or 64 bit