You should wait until you are given a clean bill of computer health to avoid any problem with creating a system repair disk.
I think that is what you are wanting to create....a System Repair Disk. A System Repair Disk can be created using any Windows 7 computer.
I would seriously recommend creating an image of the entire drive and store it on an external medium such as an external hdd or DVDs.
That's after you finish getting the malware removed.
You can use the backup program in Windows 7 or another program such as Macrium Reflect to create an image. That image
can be easily used to reinstall on existing hdd or onto another drive when your present hdd fails.
To create a system repair disc
Open Backup and Restore by clicking the Start button , clicking Control Panel, clicking System and Maintenance, and then clicking Backup and Restore.
In the left pane, click Create a system repair disc, and then follow the steps. If you're prompted for an administrator password or confirmation, type the password or provide confirmation.