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Disinfecting DOS boot record viruses that do not store the boot sector

1. Hard disk

1.1. Disinfecting DOS boot record viruses in Windows 95/98/Me and DOS
1.2. Disinfecting DOS boot record viruses in Windows NT/2000/XP/2003/Vista

2. Floppy disk

2.1. Removing DOS boot record viruses on floppy disks in Windows 95/98/Me/NT/2000/XP/2003/Vista and OS/2
2.2. Removing DOS boot record viruses on floppy disks in DOS

1. Hard disk

1.1. Disinfecting DOS boot record viruses in Windows 95/98/Me and DOS

The boot sector must be replaced using the DOS utility SYS.COM. Contact support if in doubt.

• Backup any important data on the hard drive
• Switch off the PC, wait several seconds and boot from a clean system disk to prevent the virus from being loaded into memory. This system disk must be formatted with the same version of the operating system as the PC.
• At the command prompt type

DIR C:

• Check that the contents of the infected drive are visible. If they are not contact support for advice.
  
• To overwrite the DOS boot sector enter

SYS C:

If a virus fragment is reported in upper memory then it probably indicates the presence of a virus. Contact support for advice.

1.2. Disinfecting DOS boot record viruses in Windows NT/2000/XP/2003/Vista

Do not switch the PC off. It may not be able to boot again.

Contact support.

2. Floppy disk

2.1. Removing DOS boot record viruses on floppy disks in Windows 95/98/Me/NT/2000/XP/2003/Vista and OS/2

Use Windows Explorer to copy the files to another disk. Reformat the floppy disk.

2.2. Removing DOS boot record viruses on floppy disks in DOS

At the command prompt:

Copy the files to another disk using COPY or XCOPY (not DISKCOPY). Reformat the floppy disk.