My scanner finds the Filler and/or Israeli Boot virus in memory, but after I boot from a clean floppy it reports no viruses. Am I infected?
This is almost certainly a “false positive” (see C5). One particular, popular antivirus product (usually its TSR scanner/monitor VSAFE) leaves its scan strings in memory in an unencoded form, and is well-known for causing false positives on Filler and Israeli Boot. Your other scanner sees the first’s scan strings (at least those for Filler and/or Israeli Boot) and reports a virus in memory. When you boot from a floppy you (probably) are not loading the resident scanner, so it doesn’t have a chance to “booby-trap” your other scanner. To fix this problem, try adding “REM ” to the beginning of the line in your AUTOEXEC.BAT or CONFIG.SYS file that loads the suspect TSR, and see if the problem disappears.