dont worry eminaga ist a normal account - it is even my last name - and also light and yes i have installed clamav 2 days ago - who asked-
I didnt find any user with 0 id gid
and this my passwd
root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/bin/bash
daemon:x:2:2
aemon:/sbin:/bin/bash
lp:x:4:7:Printing daemon:/var/spool/lpd:/bin/bash
mail:x:8:12:Mailer daemon:/var/spool/clientmqueue:/bin/false
news:x:9:13:News system:/etc/news:/bin/bash
uucp:x:10:14:Unix-to-Unix CoPy system:/etc/uucp:/bin/bash
games:x:12:100:Games account:/var/games:/bin/bash
man:x:13:62:Manual pages viewer:/var/cache/man:/bin/bash
at:x:25:25:Batch jobs daemon:/var/spool/atjobs:/bin/bash
wwwrun:x:30:8:WWW daemon apache:/var/lib/wwwrun:/bin/false
ftp:x:40:49:FTP account:/srv/ftp:/bin/bash
postfix:x:51:51:Postfix Daemon:/var/spool/postfix:/bin/false
mysql:x:60:2:MySQL database admin:/var/lib/mysql:/bin/false
zope:x:64:102:Zope:/opt/zope:/bin/false
sshd:x:71:65:SSH daemon:/var/lib/sshd:/bin/false
ntp:x:74:65534:NTP daemon:/var/lib/ntp:/bin/false
vdr:x:100:33:Video Disk Recorder:/var/spool/video:/bin/false
distcc:x:101:101
istcc Daemon:/etc/distcc:/bin/false
nobody:x:65534:65533:nobody:/var/lib/nobody:/bin/bash
light:x:1000:100:Light:/home/light:/bin/bash
eminaga:x:1001:100:eminaga:/home/eminaga:/bin/bash
clamav:x:52:52:ClamAV Daemon:/:/bin/false
ganz normal