You were right thorazine74.
I deleted the nvinject.kext file, restarted the computer and i was able to boot into osx(now running 10.5.7). the problem now is that whenever i open a window(safari,about this mac,etc) and i click and hold the left mouse button (so that i can move the window around) the window starts to dissapear(PHOTOS ADDED AS THUMBAILS) as you can see in the first photo i opened "about this mac." and moved it a little and this is what happened. its starting to dissapear or something. you can only see 1 of the 3 buttons on the top left side of the window. then on the second photo i decided to shake the window and it got even worse. the final 2 photos shows the same thing when trying to use safari.
ANY SUGGESTIONS WOULD BE APPRECIATED
THANX

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Mac OS X 10.5.8 II Intel Celeron(R)@2.8Ghz II MSI MS-6577 v3.1 II Nvidia GeForce FX 5200 with 128MB II 768MB of Ram II Realtek AC'97 Audio II Realtek RTL8139 Ethernet II WDC W800BB-32FJAO IDE HD II IDE DVD ROM 16x