If your computer has been infected by I-Worm.Zafi.b virus, you can download a free removal utility here.

Command line:

/s[n] - to force scanning of hard drives. Program will scan hard
drives for infection in any case.

n - include scanning of mapped network drives.
/y - end program without pressing any key.
/i - show command line info.
/nr - do not reboot system automatically in any case.
/Rpt[ao][=] - create report file
a - add report file
o - report only (do not cure/delete infected files)

Return codes:

0 - nothing to clean
1 - virus was deleted and system restored
2 - to finalize removal of virus you should reboot system
3 - to finalize removal of virus you should reboot system and start
program the second time
4 - program error.