How many antivirus software can install at one computer.?

Only have one on your pc.

Many Windows users assume that running more than one anti-virus application on their computer provides better protection against new virus strains.

Using different anti-virus programs (or multiple versions of the same program) at the same time is likely to cause problems:

You will use additional resources on your computer. This may slow down your machine and affect its performance.

You may receive false virus alerts. Anti-virus software is much like a vaccine: it uses an actual virus to detect one on your computer. As a result, each program will interpret the activity of the other as a virus.

How many antivirus software can install at one computer.?download

Best with only one (Avoid Kapersky of Norton or BitDefender...all three a major resource hogs and quite hazardous to remove - they all have a habit of doing damage on the way out!).

HOWEVER - you should have a spyware/malware application or two - those you CAN safely run more than one of, and they will often pick up on things missed by ALL anti-viral clients. Try Ewido - is the best I've seen to date.

How many antivirus software can install at one computer.?hijackthis

i've tried that it only messes with your computer you only need one.
One.
Only install one at a time. If you have 2 or more, they will fight each other and damage your computer. If you are not satisfied with one anti-virus program, uninstall it and install another one. Anti-spyware programs are a different matter. You should install at least 2 of them because no anti-spyware program can catch everything.
Install 5 and monitor using one !!

I've installed, KasperSky, NOD32, Dr. Web, BitDefender, AVG

I only use the KasperSky AntiVirus to monitor my computer and i use other AntiViruses to scan some files which i'm worried about

Sometimes, there's a file which BitDefender detects and others don't detect and sometimes there's a file which others detect and BitDefender doesn't detect !

Please Note, if you're gonna install more than 1 antivirus, Do Not enable file monitoring on all, it will hangs your computer.

Good Luck
1, NOD32