<s>
An	O
uninstaller	B-Application
,	O
also	O
called	O
a	O
deinstaller	O
,	O
is	O
a	O
variety	O
of	O
utility	O
software	O
designed	O
to	O
remove	O
other	O
software	O
or	O
parts	O
of	O
it	O
from	O
a	O
computer	O
.	O
</s>
<s>
It	O
is	O
the	O
opposite	O
of	O
an	O
installer	B-Operating_System
.	O
</s>
<s>
Uninstallers	B-Application
are	O
useful	O
primarily	O
when	O
software	O
components	O
are	O
installed	O
in	O
multiple	O
directories	O
,	O
or	O
where	O
some	O
software	O
components	O
might	O
be	O
shared	O
between	O
the	O
system	O
being	O
uninstalled	B-Application
and	O
other	O
systems	O
that	O
remain	O
in	O
use	O
.	O
</s>
<s>
Generic	O
uninstallers	B-Application
flourished	O
in	O
the	O
1990s	O
due	O
to	O
the	O
popularity	O
of	O
shared	O
libraries	O
and	O
the	O
constraints	O
of	O
then-current	O
operating	O
systems	O
,	O
especially	O
Microsoft	O
Windows	O
XP	O
.	O
</s>
<s>
Typical	O
uninstallers	B-Application
contain	O
the	O
following	O
components	O
:	O
</s>
<s>
This	O
log	O
is	O
used	O
when	O
the	O
user	O
decides	O
to	O
uninstall	B-Application
the	O
logged	O
installation	O
at	O
later	O
date	O
(	O
in	O
that	O
case	O
,	O
the	O
log	O
is	O
"	O
reversed	O
"	O
—	O
i.e.	O
,	O
the	O
log	O
is	O
read	O
,	O
but	O
opposite	O
actions	O
are	O
taken	O
in	O
reverse	O
order	O
)	O
.	O
</s>
<s>
Uninstaller	B-Application
:	O
The	O
Uninstaller	B-Application
is	O
used	O
to	O
reverse	O
changes	O
in	O
the	O
log	O
.	O
</s>
<s>
This	O
way	O
,	O
the	O
applications	O
can	O
be	O
uninstalled	B-Application
because	O
all	O
changes	O
that	O
were	O
made	O
at	O
the	O
times	O
of	O
installation	O
are	O
reversed	O
.	O
</s>
<s>
Analyzer	O
(	O
optional	O
)	O
:	O
The	O
Analyzer	O
is	O
used	O
to	O
uninstall	B-Application
programs	O
of	O
which	O
installation	O
is	O
not	O
logged	O
.	O
</s>
<s>
In	O
that	O
case	O
,	O
the	O
program	O
analyzes	O
the	O
program	O
and	O
finds	O
(	O
and	O
deletes	O
,	O
if	O
the	O
user	O
decided	O
to	O
uninstall	B-Application
the	O
program	O
)	O
all	O
related	O
components	O
.	O
</s>
<s>
Other	O
tools	O
(	O
optional	O
)	O
:	O
Some	O
uninstallers	B-Application
may	O
also	O
contain	O
other	O
related	O
tools	O
for	O
clearing	O
caches	O
or	O
removing	O
unwanted	O
files	O
.	O
</s>
<s>
Uninstall	B-Application
was	O
invented	O
by	O
Jack	O
Bicer	O
.	O
</s>
<s>
While	O
he	O
was	O
working	O
on	O
Norton	O
Desktop	O
for	O
Windows	O
at	O
Symantec	O
,	O
Bicer	O
came	O
up	O
with	O
the	O
Uninstall	B-Application
concept	O
and	O
developed	O
the	O
first	O
Uninstall	B-Application
program	O
in	O
1991	O
.	O
</s>
<s>
When	O
published	O
on	O
March	O
23	O
,	O
1992	O
,	O
NORTON	O
DESKTOP	O
FOR	O
WINDOWS	O
V.20	O
(	O
see	O
the	O
official	O
-	O
README.TXT	O
)	O
was	O
the	O
first	O
software	O
package	O
ever	O
to	O
include	O
an	O
Uninstaller	B-Application
,	O
shown	O
under	O
the	O
"	O
UNINSTALLING	B-Application
NORTON	O
DESKTOP	O
"	O
section	O
.	O
</s>
<s>
After	O
the	O
release	O
of	O
Norton	O
Desktop	O
for	O
Windows	O
2.0	O
,	O
Ken	B-Application
Spreitzer	I-Application
,	O
who	O
was	O
a	O
tester	O
for	O
the	O
product	O
at	O
Symantec	O
,	O
capitalized	O
on	O
the	O
uninstall	B-Application
idea	O
and	O
wrote	O
the	O
first	O
widely	O
used	O
PC	O
program	O
called	O
"	O
UnInstaller	B-Application
"	O
,	O
initially	O
licensed	O
to	O
MicroHelp	O
and	O
then	O
by	O
February	O
1998	O
sold	O
by	O
CyberMedia	O
.	O
</s>
<s>
Microhelp	O
published	O
Spreitzer	O
's	O
program	O
as	O
Uninstaller	B-Application
version	O
1	O
.	O
</s>
<s>
In	O
1995	O
,	O
Spreitzer	O
told	O
The	O
New	O
York	O
Times	O
that	O
the	O
royalties	O
he	O
received	O
from	O
Microhelp	O
for	O
Uninstaller	B-Application
made	O
him	O
a	O
millionaire	O
by	O
age	O
30	O
.	O
</s>
<s>
Tim	O
O'Pry	O
,	O
while	O
president	O
of	O
Microhelp	O
,	O
substantially	O
rewrote	O
the	O
code	O
for	O
Uninstaller	B-Application
version	O
2	O
,	O
which	O
became	O
a	O
best-selling	O
program	O
.	O
</s>
