Maximum RAM restrictions
Solution 1:
The Maximum amount of memory is also determined by OS, in your case depending of your Windows 7 Version:
Home Basic : 8GB
Home Premium : 16GB
Professional : 192GB
Ultimate : 192GB
Corporate : 192GB
Comparison Chart Windows 7
Also is good to check what the brand says.
About ET1862 Here is the datasheet it says:
Maximum 4 GB
And is determined also for CPU:
Here is the datasheet of your CPU it says:
Maximum 16 GB
for your Motherboard Specifications too it says:
Maximum 16 GB
Here is a link for yours: