Hi WHS
I'd go a bit further than that --just restoring an image on a single partition might not do the trick if the infection is lurking in data on another partition --which is why I'd recommend wiping the ENTIRE DISK and THEN restoring clean images and data.
Even if you have a SINGLE disk image I'd still do the reformat just to make sure --and I'd do the reformat from either a Windows install disk or from another "Live disk" such as a Linux Live CD / Gparted / etc.
Don't use the infected system's OS to "Cleanse" your disk.
Cheers
jimbo