RAM not registering

I had recently added in some new Ram - Kingston ddr2 2gb - onto my system that currently held 2gb.
As you can see from the "specs" pic, the motherboard - Asus M2N68 - recognized the addition but allows 3gb to be used.
However, as seen in my pic "taskmgr", the 2gb is still just being used, and no big improvements have occurred in the system.

Anybody can give any advise please?

Thanks in advance

You're only going to notice an improvement when you are using that extra ram (ie multitasking, or doing large scale editing), or if going from single channel, to dual channel mode by adding that stick. If you're not using it, how would you see a benefit?

It looks fine to me.

Notice the TaskMgr shows
Physical Mem = 3071
That's the XP limit and 1Gb of the new memory is active and available as REDK noted