Who does not know, you look at buying something for your own PC, and then must always angry when something does not work the same.
Then often begins the long search for the error, liegts the operating system, the drivers, or it is attached incorrectly.
From all this one is not confronted with the Kingston 2GB DDR2 RAM. Just the old with the new bolt swap and that's it.
!!! Warning if you want to install 4GB. Not every motherboard can. In Windows XP you will also get not allocated every 4 GB, there remain a few 100 MB on the track. I myself have built 2 bar in Windows Vista. Although the BIOS does not recognize 4 GB, Windows Vista may nevertheless address all 4GB.