<s>
ClamWin	B-Language
Free	I-Language
Antivirus	I-Language
is	O
a	O
free	B-License
and	I-License
open-source	I-License
antivirus	B-Application
tool	I-Application
for	O
Windows	O
.	O
</s>
<s>
It	O
provides	O
a	O
graphical	O
user	O
interface	O
to	O
the	O
Clam	B-Application
AntiVirus	I-Application
engine	O
.	O
</s>
<s>
Context	O
menu	O
integration	O
for	O
Windows	B-Protocol
Explorer	I-Protocol
.	O
</s>
<s>
There	O
are	O
Firefox	O
extensions	O
that	O
allow	O
the	O
users	O
to	O
process	O
downloaded	O
files	O
with	O
ClamWin	B-Language
.	O
</s>
<s>
ClamWin	B-Language
Free	I-Language
Antivirus	I-Language
scans	O
on	O
demand	O
;	O
it	O
does	O
not	O
automatically	O
scan	O
files	O
as	O
they	O
are	O
read	O
and	O
written	O
.	O
</s>
<s>
The	O
non-affiliated	O
projects	O
Clam	O
Sentinel	O
and	O
Winpooch	O
are	O
add-ons	O
that	O
provide	O
a	O
real-time	O
scanning	O
capability	O
to	O
ClamWin	B-Language
.	O
</s>
<s>
ClamWin	B-Language
Free	I-Language
Antivirus	I-Language
has	O
a	O
virus	O
database	O
which	O
is	O
updated	O
automatically	O
when	O
it	O
detects	O
connection	O
to	O
the	O
Internet	O
.	O
</s>
<s>
Historically	O
ClamWin	B-Language
Free	I-Language
Antivirus	I-Language
has	O
suffered	O
from	O
poor	O
detection	O
rates	O
and	O
its	O
scans	O
have	O
been	O
slow	O
and	O
less	O
effective	O
than	O
some	O
other	O
antivirus	B-Application
programs	I-Application
.	O
</s>
<s>
For	O
example	O
,	O
in	O
2009	O
ClamWin	B-Language
Free	I-Language
Antivirus	I-Language
failed	O
to	O
detect	O
almost	O
half	O
of	O
the	O
trojan	O
horses	O
,	O
password	O
stealers	O
,	O
and	O
other	O
malware	O
in	O
AV-TEST	O
'	O
s	O
"	O
zoo	O
"	O
of	O
malware	O
samples	O
.	O
</s>
<s>
In	O
the	O
1	O
–	O
21	O
June	O
2008	O
test	O
performed	O
by	O
Virus.gr,	O
ClamWin	B-Language
Free	I-Language
Antivirus	I-Language
version	O
0.93	O
detected	O
54.68	O
%	O
of	O
all	O
threats	O
and	O
ranked	O
37th	O
out	O
of	O
49	O
products	O
tested	O
;	O
the	O
best	O
scored	O
over	O
99%	O
.	O
</s>
<s>
In	O
the	O
10	O
August-05	O
September	O
2009	O
test	O
performed	O
by	O
Virus.gr,	O
ClamWin	B-Language
Free	I-Language
Antivirus	I-Language
version	O
0.95.2	O
detected	O
52.48	O
%	O
of	O
all	O
threats	O
and	O
ranked	O
43	O
out	O
of	O
55	O
products	O
tested	O
;	O
the	O
best	O
scored	O
98.89	O
%	O
.	O
</s>
<s>
On	O
6	O
September	O
2011	O
cNet	O
gave	O
ClamWin	B-Language
Free	I-Language
Antivirus	I-Language
a	O
rating	O
of	O
excellent	O
,	O
4	O
of	O
5	O
stars	O
.	O
</s>
