1. Keep your AV package up-to-date
2. Create email "rules" to auto-delete the offending messages
3. Petition your ISP to install AV software on their respective email servers.
4. Change your email address
5. Install *all* Critical Updates via the Windows Update web site.
Infects as well as infests. Uses a 'companion-like' method of
infection. Whereas Klez.h would infect by renaming the target
file and placing a copy of itself in its place, this one moves the
target's original code (or at least it attempts to) into an alternate
data stream (on NTFS) and attempts to execute that code
after its own so that the user would be none the wiser. It is
also a password stealer dropper.