Keep in mind we are talking about an infection of the Master Boot Record. Boot sector viruses are VERY rare,
First of all, MBR
(Master boot record) and boot sector
are two different things.
MBR infections are very common these days and pretty easy to fix, although the security implications (backdoor capability) is another story.
The following quote from the originally linked to article, makes me think the authors have mixed up boot sector and MBR:
"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," said Feng.
In other words, they are talking about an MBR rootkit, which is really nothing new; MBR rootkits nowadays can infect both 32 bit and 64 bit versions of Windows and are as common as other malware.
Microsofts malware encyclopedia provides zero useful information as to what we are dealing with exactly.
My recommendation for anyone infected with a boot sector virus has always been a low level format and a reinstallation of the OS.
I agree with this; I would never trust a windows installation that has had any rootkit infection and I always recommend others I'm helping to consider a complete reformat and reinstall.