how to turn off anti virus on macbook pro?

Are you talking about Gatekeeper. If so then go to system preferences and set gatekeeper to allow installation of all apps from anywhere. After installing yor app then reset the gatekeepr to a more secure setting. Here is a more complete explanation: OS X: About Gatekeeper - Apple Support

Hi Maezam:

I found this on the Kaspersky web sit. https://support.kaspersky.com/4801

You do not need a virus program on your Mac, it will just cause issues.

See the following post by Linc Davis where he explains why not to use AntiVirus programs on Mac. Re: antivirus

Kim

By deleting it. Mac has its own AV protection built in so no third party AV applications are needed. All they will do is slow down your MBP and possibly corrupt it.

Ciao.

Maybe if you told us which AV software you are running, we might be able to give you more specific instructions.

Either that or download and install EtreCheck from http://etrecheck.com/

Run it and post the report here. Then we can see which of the AV scams you loaded.

maezam wrote:

I suppose to install a nikon viewNx2 software, but the installation is not successful, it mention that i need to turn off any anti virus on my computer.

Did you get the Nikon software from a trustworthy source (a Nikon install DVD, or directly from Nikon's site)?

What is the AV that is running?

Have you tried to force quit it? (OPTION + COMMAND + ESC)

Open Activity Monitor and see if it listed there.

Ciao.

maezam wrote:

My AV is Kaspersky 2011

Delete it. It can harm your operating system.

Did you try a FORCE QUIT?

Ciao.