Heya Who_Used_My Welcome to PCHF

As long as you have the matching sticks of memory in the same color slots (either both sticks in the green slot, or both sticks in the orange slot) then I would just ignore what CPU-Z says. If you had the memory set up incorrectly, you would have had an error during boot up.

So basically, check to make sure your memory sticks are in the right slots, then check in Windows system properties to make sure Windows recognizes 2 gigs of memory. If both of those check out, you're fine.