From the comments.. You do not need to reformat.
This article needs to be corrected. The source does NOT say you have to reinstall Windows. Here is how to recover from it. This will not force you to reinstall Windows.
“If your system does get infected with Trojan:Win32/Popureb.E, we advise you to fix the MBR and then use a recovery CD to restore your system to a pre-infected state (as sometimes restoring a system may not restore the MBR). To fix the MBR, we advise that you use the System Recovery Console, which supports a command called “fixmbr”.”