can someone help me with a ram problem?

hi i just upgraded my pc to have 4gigs of ram (my current system is vista home premium 64-bit) and when i right click my computer it reads that i have 4gigs in there but when i run a DXdiag it says this.

Memory: 2942MB RAM
Page File: 1701MB used, 4418MB available

and then when i ran another program it said i had 2.9gigs and 1.7gigs of ram on my video card, am i reading this wrong? or was i just screwed by the place i took my pc in to get upgraded?

you mean like open up my pc and take a look to check the ram sticks?

yes