Windows 7 - Problem with new installed hardware

Hello,
I recently bought some new hardware and I installed them by myself. But I faced a few problems.
1- I always install both windows XP and 7, but on the new device when I want to install XP SP3, after loading installation files bluescreen error apears:

A problem has been detected and windows has been shut down to prevent damage to your computer.

MEMORY_MANAGEMENT

If this is...

Technical information:

*** STOP: 0x0000001A (0x00041287,0x0000002C,0x00000000,0x00000000)

2-when I'm working on windows 7 suddenly both video and audio freeze. I just can restart PC. this happens several times a day and it's very annoying.

3-Again during working with 7 bluescreen error apears:
memory dump.

My new hardware:
Asus P8Z68-V pro
Intel i3 2120
3x Kingston 2GB 1333 (KVR1333D3N9/2G)
Maxtor 300GB
Western 1TB kaviar green
600 turbo power
by the way my power supply is a bit old and it has 4 pin cpu connector.
I could find KVR1333D3N9K2/4G on mothboard supported ram list ,but mine isn't exactly the same model, is that a problem?

Thinking out loud here...

The Asus mobo uses Dual Channel Memory Architecture and per the instructions in section 2-6 of the user manual:

Memory configurations
You may install 1GB, 2GB, 4GB and 8GB unbuffered and non-ECC DDR# DIMMs into the DIMM sockets.

You are using three sticks which is not permitted on this mobo. Either remove one stick or purchase and add another stick.

Regards,
GEWB

The Asus P8Z68-V pro has a EFI BIOS, have you made a the GPT drive partitions?


Recommended UEFI-Based Disk-Partition Configurations
If yes, both OS's need to be 64 bit.

As GEWB, has said check out the ram.

I tried that once, before windows 7 installation and I had the first problem (at least). But I hope it will solve the other problems.
Thanks

I had no idea about that. I should try.
Thank you

By removing one of memories, everything is fine. Do I really need the GPT drive partitions?

NO.