<s>
Computer	B-Device
maintenance	I-Device
is	O
the	O
practice	O
of	O
keeping	O
computers	O
in	O
a	O
good	O
state	O
of	O
repair	O
.	O
</s>
<s>
If	O
the	O
cooling	B-General_Concept
system	I-General_Concept
is	O
not	O
filtered	O
then	O
regular	O
computer	B-Device
cleaning	I-Device
may	O
prevent	O
short	O
circuits	O
and	O
overheating	O
.	O
</s>
<s>
When	O
major	O
maintenance	O
such	O
as	O
patching	O
is	O
performed	O
,	O
a	O
backup	O
is	O
recommended	O
as	O
the	O
first	O
step	O
in	O
case	O
the	O
update	O
fails	O
and	O
reversion	B-General_Concept
is	O
required	O
.	O
</s>
<s>
Disk	B-Application
cleanup	I-Application
may	O
be	O
performed	O
as	O
regular	O
maintenance	O
to	O
remove	O
these	O
.	O
</s>
<s>
Disk	B-Application
defragmentation	I-Application
may	O
be	O
performed	O
to	O
combine	O
these	O
fragments	O
and	O
so	O
improve	O
performance	O
.	O
</s>
<s>
Operating-system	B-General_Concept
files	O
such	O
as	O
the	O
Windows	B-Protocol
registry	I-Protocol
may	O
require	O
maintenance	O
.	O
</s>
<s>
A	O
utility	O
such	O
as	O
a	O
registry	B-Application
cleaner	I-Application
may	O
be	O
used	O
for	O
this	O
.	O
</s>
<s>
Also	O
inbuilt	O
Disk	B-Application
defragmenter	I-Application
will	O
also	O
help	O
.	O
</s>
<s>
Softwares	O
packages	O
and	O
operating	B-General_Concept
systems	I-General_Concept
may	O
require	O
regular	O
updates	O
to	O
correct	O
software	B-Error_Name
bugs	I-Error_Name
and	O
to	O
address	O
security	O
weaknesses	O
.	O
</s>
<s>
Maintaining	O
security	O
involves	O
vulnerability	O
management	O
and	O
installation	O
and	O
proper	O
operation	O
of	O
antivirus	B-Application
software	I-Application
like	O
Kaspersky	B-Application
,	O
Avast	B-Operating_System
Antivirus	I-Operating_System
,	O
McAfee	O
and	O
Many	O
are	O
available	O
.	O
</s>
