Vote for avast! BART CD
avast! Bootable Antivirus & Recovery Tools CD (BART CD) is a bootable CD, giving you the capability to detect/clean virus infections on a computer. All this can be done fast and reliably, without the risk of spreading the infection any further. It also contains tools for editing the registry files (i.e. the files holding Windows Registry for the operating system) and a tool to check and fix disk errors. And now the main feature is it works on all Windows-supported file systems, i.e. NTFS as well. Less common storage devices, such as SCSI/RAID, are also supported. In general BART will work on all disk devices that Windows XP will work on. Non-standard devices (e.g. in servers) can be handled by standard Windows XP drivers supplied by the hardware vendor.