The AntiVirus software then prevents the system from booting because it realizes there is a virus present. Click on the Rescue Disks menu of the CSS program. This will create a DOS rescue disk that can be used on any Windows 95 system and a second floppy with boot sector information specific to the system running the program. This would allow recovery of a system with a boot sector that can't be repaired. Not a likely occurance if you are running a current version of the anti-virus program, but there's no harm in making the disk.
Floppies are cheaper than lost files.
You should see daylight through both holes at the corners of the disk. Power on the computer with the boot floppy installed. After the computer boots insert the first F-Prot Rescue Disk. When completed remove the floppy and reboot. You should be in business.