Windows 7 - Windows Home Premium x64 only recognizes 3.74 of my 8gigs of RAM

Hello, I know you all must get these questions often, and I tried to look at other threads but frankly nothing worked for me...

I am currently running Windows Home Premium 64-bit which, according to the memory limits page, can support up to 16gigs of RAM. My system is only using four, can anyone help me fix this?

I already unchecked the maximum memory option in the advanced BOOT settings.

Sorry for the dumb question.

Thanks

Post a screen shot of the memory tab of Resource Monitor.

Added.

The usable memory may be less than the installed memory on Windows 7-based computers

Well, over 4 gigs for hardware reserved.

I can't recall hearing of that before and can't directly help you further.

You might want to fill in your system specs as much as possible to further assist anyone else reading this.

Could their BIOS be set up to not use any onboard video memory or something?

Does Windows POST 8Gb during boot?

I'm not sure what you mean... Sorry.
I updated the title to what the problem seems to be...

And my system specs are (Terrible I know ):

CPU: AMD Athlon(tm) II P340 Dual-Core Processor
Motherboard: Hewlett-Packard 1444
BIOS: Default System BIOS
Total Memory: 8.00 GB
Usable Memory: 3.75 GB
HDD: WDC WD32 00BEVT-60A23T0 SATA Disk Device
Sound Card: (1) ATI High Definition Audio Device (2) Realtek High Definition Audio
Graphics Card: AMD M880G with ATI Mobility Radeon HD 4250
OS: Microsoft Windows 7 Home Premium 64-bit 7600 Multiprocessor Free

It occasionally happens with 10600 RAM on some boards. You should try RMAing it for 10666 RAM.

Might have to enable memory remap in the BIOS settings, as mentioned in Sardonicus' link.