Alright, so I had 1GB (512MBx2) of RAM installed in my PC and I just put in another gig. Now my computer says that there's 1.5GB of RAM. CPU-Z says I have 2048 MB and Belarc Advisor says:
1536 Megabytes Installed Memory
Slot '0' has 512 MB
Slot '1' has 512 MB
Slot '2' has 512 MB
Slot '3' has 512 MB
Does anyone know where the problem lies?