Hope this might help :
http://www.sophos.com/support/disinfection...dbrvir.html#1.1 1.1. Disinfecting DOS boot record viruses in Windows 95/98/Me and DOS
* 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.
* Put a floppy disk containing a copy of 'SWEEP for DOS' in the floppy disk drive and at the A: prompt type
*
SWEEP *: -DI
* When requested insert the floppy disk containing the virus data.
* Run another scan to check that the virus has been removed.
If infection persists replace the boot sector using the DOS utility SYS.COM. Contact support if in doubt.
* Switch off the PC, wait several seconds then 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.