Virus attacs is very common, and every one who is using the internet or swap
files one way or another, should always have a updated Anti Virus Protection
software installed and running.
However, for those who who still "travel" unprotected, there is a removaltool
for this fast spreading infection at Symantec's website.
But remember, there are not much help in remove any of those "guests" from the
PC if you don't install or runs any program to make sure that your protection
is updated to fight the next or future attacs!
GJ

URL for removal tool and description: http://securityresponse.symantec.com/avcenter/venc/data/w32.klez.gen@mm.html