Well Finally...
After almost 36 hours of trying everything to update to 10.5.2 im reporting success...

But, the new Kernel 9.2 needs to be downloaded and applied with the dsmos.kext

The LeoGraphicsUpdate with GeForce 8600GT and patches at first gave me Kernel Panic but i restored the NV* & Ge* kexts with NVinject and its up and running flawless, it even managed to take away the Glitches and some Antialiased problems

Also downloaded the old nvinject 0.1.3 cause it shows in System Profiler my Video Card (8600GT) with the correct Ram

Running on: nForce 4 Ultra, s939, x64 4200, 1Gb Ram, 8600GT, USB Audio (M-Audio Transit), nForce Lan, USB Modem (Sprint PCS Broadband)

Time Machine Backups fixed (little icon in the taskbar spins!!!) :-D

Success Report