How do I get my antivirus software to allow me to install Photoshop?

Mike asked: My McAfee AntiVirus software won’t let me install Photoshop.
Any ideas on how to fix it?
It’s Photoshop from a CD, not a website.
Stop suggesting to get new software, thats stupid.
There is no disable button.

Is it required to enable the antivirus software to run during the startup?

bsp asked: My PC is booting very slow. Is it required to enable the antivirus software to run during the startup?