Install 2 Antivirus or more in 1 Computer

Appear several times a comment or question about what if we install Antivirus 2 or more in a single computer. Some of us may conclude that the computer will be more secure from viruses, and some others may give opinions that it is not necessary.
How should? whether we need to use 2 or more antivirus in a single computer? Here a little review on it. In fact, if not so required, is not recommended to install Antivirus 2 or more, except perhaps with a local antivirus that just to clean the virus only (manual scan). Antivirus vendor's own usually also recommend to use only one antivirus.
To be considered :
If you want to install 2 antivirus in one or more computers, have to consider several things such as:
Specification Computer, make sure the CPU and Memory (RAM) enough. We can see the need or the recommended minimum of each antiviral. If antivirus is not able to give a warning or do not match with certain antivirus, it should not be forced, which will be provided in a higher priority. And may also need to read the information / explanation of each antiviral.

Some Antivirus can walk along :
There are some antivirus which can sometimes run together in one computer and not so problematic, except perhaps the Memory / CPU is increased. From my experience alone, never try AVG Free Edition 7.5 for version 8.0 or 8.0 with the Free. Similarly when the Avast 4.8 Home Edition (Free). Never even tried to use third of them together and it does not cause problems to the system, but the computer will work very slow.
Similarly when trying to Rising avira antivirus free edition, can be run without problems on the system, also 10 Bit Defender Free Edition and Avira. but when I try Kaspersky 2009, could not be installed if you have Avira antivirus, possibly also with other antivirus. For other anti-antivirus has not been tried.
What if 2 Antivirus detects the same virus :
When there are 2 or more antivirus and installed on the computer, its possible to do and it is very possible. And sometimes this can cause problems, because if the virus is usually detected, antivirus will lock the virus (the file), so can not be accessed, run or even in the clear in the manual. May occur when antivirus try to delete or quarantine, it does not succeed / fail because the virus is locked by other antivirus.

Still want to install 2 Antivirus?
If you want to maintain the install 2antivirus or more, but worry will crash, error, conflict, and work computer so slow, we can do it with only one antivirus activate it. Mean? Each menu usually have antivirus that work on the computer monitor at any time, such as: Active guard, Real-time guard, Proactive defense, Resident shield, Resident Protection, and so forth. To prevent conflicts and reduce the burden on the computer can be done with only the features for only one antivirus. While other anti-virus turned off (not activated), so only used to perform scan manually if needed only. Or can also turn off the autorun feature to prevent or antivirus running automatically with windows, can be arranged through a program like Autoruns. There will be seen what the antivirus running when windows start (booting). But with the autorun just sometimes not enough, because the antivirus itself can activate the service through the windows (can be checked in the Control Panel> Administrative Tools> Services).
Experience is also important :
This may also be made in consideration of the experience of others who had to install 2 antivirus in one or more computers. If you have friends who use two or more antivirus please provide feedback / comments. Whether there have been a problem or not, so that it can complement each other and become a science for us