Microsoft Security Advisory (904420) - Win32/Mywife.E@mm

It says on the said advisory:

"What is the potential damage?

On the third day of every month, beginning Friday February 3, this variant of the malware resets the content of files that have specific file name extensions. It searches for files on the hard disk that have the following file name extensions and replaces their contents with "DATA Error [47 0F 94 93 F4 K5]":
.doc
.xls
.mdb
.mde
.ppt
.pps
.zip
.rar
.pdf
.psd
.dmp"

To remove this W32.Blackmal.E@mm worm:

Get the removal tool from Symantec at:
http://securityresponse.symantec.com/avcenter/venc/data/w32.blackmal.e@mm.html

You can also try to use the disinfection utility from F-secure for the above worm:
http://www.f-secure.com/v-descs/nyxem_e.shtml

Please follow their instruction in using the removal tools.