Check here and run through some of the suggestions. Also make sure Poser has permissions with your firewall software, and anti virus software (might need to add it as an exception. If your lucky it's an update on either the firewall or anti virus software.

http://compfreakstars.blogspot.com/2011/11/0xc0000005-error-every-day-many.html

Edited to add the following

*Try making sure your video card driver is up to date. It also could be that the video card driver updated and is a bad update so you might have to rollback the driver

*http://windows.microsoft.com/en-us/windows/restore-driver-previous-version#1TC=windows-7

*Apparently some bad drivers

*http://www.dailytech.com/Windows+10+Testers+Beware+Experimental+NVIDIA+Drivers+Tied+to+DX12+Update/article37211.htm

I'd hate to be the bearer of possible bad news, but it could be a memory stick that's gone bad due to heat or manufacturing issues.

http://www.tomshardware.com/forum/239451-45-0xc0000005-access-violation

Luckily replacing and adding memory is cheap. If you are comfortable with pc repair...

http://www.newegg.com/MemoryFinder/

Instructions and videos

http://www.wikihow.com/Add-Extra-Memory-to-Your-Computer

Not the best tutorial... but covers the basic. Don't do the install on carpeting. Take the pc to a room without carpeting. Also use a can of compressed air for cleaning, don't vacuum. Static electricity of any kind is deadly to pc components. Ideally use the wrist strap he mentions (about $5 at New Egg or Amazon.com). You normally connect it to a ground.

https://www.youtube.com/watch?v=tYusJ4gYVG8

The dust settled, thinking "what a fine home, at least for now" not realizing that doom would soon be coming in the form of a vacuum cleaner.