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I've encountered this problem. I purchased additional DDR 2 (800) RAM, 4 GB in 2 sticks of 2 GB each.

This window pops up after installing any OS on the computer when it has 8 GB of RAM. There are 4 sticks of 2 GB each.
This error doesn't occur with 4 GB. The computer's hardware has been fully tested... The BIOS has been updated to the latest version. Manipulations with the registry don't help. On a 64-bit system, the computer sees all 8 GB.
CPU: Q6700 2.66Gz
RAM: 8 GB DDR 2 (800)
Motherboard: P5N32SLIPremium
Graphics Card: 9800 Geforce 1Gb
The message appears during the very first boot. Sometimes it pops up during the installation process. (And, accordingly... it ends with STOP: periodically.)
Please advise on how to resolve this issue.
P.S. All sticks are Kingston, CL-5.