What is it?

pgaccount.exe is associated with DiamondCS ProcessGuard software.

What does it do?

From DiamonCS:

"ProcessGuard is a powerful new cutting-edge program that greatly increases
the security of your computer by preventing processes from being able to attack
each other. It is considered by experts to be a must-have program for all users
of Windows, and is the only program available that can actually prevent the
installation and infection of all known rootkit stealth trojans."

More info:

Read more about ProcessGuard at [url=http://www.diamondcs.com.au/processguard/index.php?page=home]DiamondCS.com[/url]