SL Post Install problem

This is my first post, and I hope my question will not look very noob, because I am in mac OS.
Through reading I managed to install SL universal on my HP Pavilion dv5, then I updated to version 10.6.3 from Apple.
Everything seams to be working ok apart from that some applications such as Quick Time, Preview and any other application I try to install. The applications like iWork09 would open and I can click any button on its bars but I can not write anything in it. checking the log it says something like invalid context and invalid pixel format.
My config. is as follows:
Hardware Overview:

Model Name: iMac
Model Identifier: iMac9,1
Processor Name: Intel Core 2 Duo
Processor Speed: 3 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 3 MB
Memory: 4 GB
Bus Speed: 1.33 GHz
Boot ROM Version: IM91.008D.B00
SMC Version (system): 1.13f3
Serial Number (system): W87552DW2E2
Hardware UUID: 50BA0AE0-CFB4-11DE-9990-A2D356D89593

Graphics by NVIDIA:

Chipset Model: Graphics by NVIDIA
Type: GPU
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 256 MB
Vendor: NVIDIA (0x10de)
Device ID: 0x06e8
Revision ID: 0x00a1
ROM Revision: NVinject 0.2.2
Displays:
LP154WX4-TLCB:
Resolution: 1280 x 800
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Display Connector:
Status: No Display Connected

System Software Overview:

System Version: Mac OS X 10.6.3 (10D573)
Kernel Version: Darwin 10.3.0
Boot Volume: Snow
Boot Mode: Normal
Computer Name:
User Name:
Secure Virtual Memory: Enabled
64-bit Kernel and Extensions: Yes

for any help