10.5.6 retail - freezes

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My configuration is:

m.board: a-bit fatal1ty fp in9 sli (north bridge nforce 650i sli chipset / south bridge nForce 430i (MCP51) )

proc: core 2 duo e6750 , 2.66ghz

video: nvidia 8800 GTS [G80] / 640mb / 320bit / pcie / sparkle

ram: 4x1gb / 800mhz / kingston

hdd #1: wd / 500gb / sata / aaks series

hdd #2: wd / 500gb / sata / aaks series

hdd #3: wd / 40gb / ide

dvd-rom: teac / ide

sound card: mbox 2 pro

firewire: - / 400mbs / pci

keyboard: default / usb

mouse: logitech g5 / usb

 

My problem is:

I installed RETAIL MAC OS X 10.5.6 : ... when listening itunes or playing video film, or writing smthing to somebody in skype - after ~30sec the system freezes and all ;[

 

I tried:

-update to 10.5.7

-to delete AppleUpstreamUserClient.kext

-mouse and keyboard are connected in usb.

-reinstall 10.5.6 version

-install 10.5.4 - but nothing - i cant install it , because - http://i28.tinypic.com/29atvs0.jpg

-to delete nvkush.kext and use strings for my video card

-load with minimum of preload kexts:

AppleDecrypt.kext

AppleNForceATA.kext (tried other nforceata - with them can't load system)

AppleSMBIOS.kext

Disabler.kext (inside this kext i added code to disable AppleUpstreamUserClient.kext)

-remove quick time completely

-add IOUSBFamily.kext

-DSDT patching by Universal OSx86 Installer

After all deleting/adding of kexts i run fix kext permission

 

Finaly:

AND STILL PROBLEM IS NOT SOLVED, please help ;[