F-Secure offers a free antivirus program for DOS. This can be run from a command line within windows or you can boot the system from a DOS floppy or CD when you can't get Windows to start properly or want to run an antivirus program from outside of Windows. The program is available from F-Secure at Free Virus Removal Tools, which provides a link for downloading the software from F-Secure's FTP site at ftp://ftp.f-secure.com/anti-virus/free/.
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