What are your system specifications?
Just for thought - even though the memory test came out with no errors, there can be memory compatibility issues with some motherboards.
For example, 5 years ago I did a small gaming build, here are the specifications:
Motherboard - ASUS M2N68-AM Plus
CPU - AMD Phenom X4 9850 2.50 Ghz
Memory - Corsair 2 GB DDR2 800 MHz
Hard Disk - WD 250 GB SATA II
GPU - NVIDIA Geforce 210 512 MB DDR2 - Old version of Geforce 210 before DDR3 release
Power Supply - XION 400W power supply
DVD Writer - Liteon DVD-RW writer
When I first got the build done, I had nothing but issues. First problem was I had the wrong CPU, as this motherboard would only support 95W CPU's while mine was a 125W CPU. Anyway, I would have "Memory Management" bluescreens, and random freezes on the system under Windows 7 Professional x64. I changed my CPU to an AMD Phenom II X6 AM3 95W 2.70 Ghz. This got rid of the CPU problem, however, the memory management bluescreens still persisted.
I did some research, and it says that these bluescreens could be caused from faulty RAM, or other faulty hardware, such as the Graphics Card, or could be a bad memory controller in the CPU. With having 2 different CPU's, I ruled out the possibility of a bad memory controller.
Next, I changed my Geforce 210 out with an ATI Radeon HD 2400 Pro. After I installed this, the bluescreens got worse, with the same Memory Management Error. So, lastly, I decided to change out the memory with a different brand.
I bought a PNY 2 GB stick 800 Mhz, and installed it in my system. My motherboard brought up that there was a different memory module during post, and I had to go into the BIOS and load optimized defaults. I booted up the computer, and the bluescreens were gone. No random freezes either.
I sent the Corsair memory stick back since it was defective. I sold that computer system to my friend, and that system continues to run.
Now, this was just my issue, and your problem could be caused from something else. I'm hoping I can help you on this issue.
Thanks.