<s>
Prevx	B-Application
is	O
a	O
discontinued	O
anti-malware	B-Application
utility	O
.	O
</s>
<s>
It	O
can	O
remove	O
low-risk	O
adware	O
for	O
free	O
,	O
but	O
the	O
user	O
has	O
to	O
purchase	O
and	O
enter	O
a	O
license	B-Application
key	I-Application
if	O
it	O
is	O
more	O
serious	O
.	O
</s>
<s>
Prevx	B-Application
Limited	O
was	O
formed	O
in	O
March	O
2001	O
in	O
the	O
UK	O
and	O
registered	O
under	O
the	O
name	O
“	O
Immunify	O
”	O
,	O
changing	O
its	O
name	O
to	O
“	O
TrustCorps	O
”	O
later	O
that	O
year	O
and	O
finally	O
re-branded	O
as	O
“	O
Prevx	B-Application
”	O
in	O
2003	O
.	O
</s>
<s>
The	O
software	O
was	O
positioned	O
the	O
last	O
line	O
of	O
defence	O
against	O
threats	O
that	O
had	O
bypassed	O
or	O
overcome	O
firewall	O
,	O
network	O
security	O
and	O
any	O
installed	O
anti-virus	B-Application
or	O
other	O
host-based	O
protection	O
systems	O
.	O
</s>
<s>
In	O
2003	O
,	O
the	O
company	O
rebranded	O
to	O
Prevx	B-Application
and	O
in	O
June	O
2004	O
launched	O
its	O
first	O
product	O
for	O
the	O
Windows	O
platform	O
,	O
“	O
Prevx	B-Application
Home	O
-	O
Beta	O
”	O
,	O
offered	O
as	O
a	O
freeware	O
download	O
.	O
</s>
<s>
Prevx	B-Application
Home	O
1.0	O
(	O
also	O
free	O
)	O
followed	O
in	O
September	O
2004	O
.	O
</s>
<s>
Prevx	B-Application
Home	O
2.0	O
launched	O
in	O
October	O
2004	O
and	O
incorporated	O
functionality	O
to	O
report	O
the	O
security	O
events	O
it	O
detected	O
to	O
a	O
central	O
database	O
,	O
operated	O
by	O
Prevx	B-Application
,	O
which	O
would	O
allow	O
Prevx	B-Application
to	O
monitor	O
new	O
virus	O
outbreaks	O
and	O
detect	O
and	O
block	O
spyware	O
.	O
</s>
<s>
By	O
the	O
end	O
of	O
2004	O
,	O
6	O
months	O
after	O
launching	O
,	O
over	O
1m	O
copies	O
of	O
Prevx	B-Application
had	O
been	O
downloaded	O
.	O
</s>
<s>
Subsequent	O
versions	O
included	O
Prevx	B-Application
3.0	O
,	O
Prevx	B-Application
Edge	O
and	O
Prevx	B-Application
CSI	O
.	O
</s>
<s>
Prevx	B-Application
stirred	O
up	O
controversy	O
amongst	O
the	O
internet	O
communities	O
when	O
they	O
announced	O
on	O
November	O
27	O
,	O
2009	O
that	O
a	O
recent	O
Windows	O
update	O
was	O
causing	O
a	O
"	O
Black	O
Screen	O
of	O
Death	O
"	O
,	O
affecting	O
users	O
of	O
Windows	O
XP	O
,	O
Vista	O
and	O
7	O
.	O
</s>
<s>
Prevx	B-Application
then	O
apologized	O
for	O
its	O
earlier	O
claims	O
.	O
</s>
<s>
In	O
2005	O
,	O
Prevx	B-Application
was	O
acquired	O
in	O
an	O
all	O
share	O
offer	O
by	O
Retento	O
Limited	O
,	O
an	O
investment	O
vehicle	O
owned	O
by	O
serial	O
entrepreneur	O
Mel	O
Morris	O
,	O
who	O
had	O
joined	O
the	O
Prevx	B-Application
board	O
in	O
June	O
2003	O
and	O
was	O
an	O
investor	O
in	O
Prevx	B-Application
introduced	O
by	O
Hotbed	O
.	O
</s>
<s>
Retento	O
was	O
subsequently	O
renamed	O
Prevx	B-Application
Group	O
Limited	O
.	O
</s>
<s>
In	O
November	O
2010	O
,	O
Prevx	B-Application
was	O
acquired	O
by	O
US-based	O
Internet	O
security	O
company	O
Webroot	O
.	O
</s>
<s>
The	O
full	O
conditions	O
of	O
the	O
deal	O
were	O
not	O
released	O
but	O
the	O
announcement	O
was	O
made	O
that	O
Webroot	O
will	O
fully	O
integrate	O
Prevx	B-Application
's	O
behaviour-based	O
antivirus	B-Application
technology	O
into	O
their	O
existing	O
software	O
and	O
also	O
make	O
Mel	O
Morris	O
,	O
founder	O
and	O
chief	O
executive	O
of	O
Prevx	B-Application
Group	O
,	O
the	O
vice	O
president	O
of	O
Webroot	O
's	O
Prevx	B-Application
division	O
.	O
</s>
<s>
Webroot	O
has	O
since	O
discontinued	O
the	O
Prevx	B-Application
product	O
line	O
although	O
the	O
technology	O
and	O
concepts	O
continue	O
to	O
underpin	O
Webroot	O
products	O
.	O
</s>
