can't shut down machine after installing kmod-nvidia

[amdhorus]

Hi all,
I am a newb of FC6. I'm a Chinese and my English is poor. Please forgive me for any English mistakes .

I have just installed the kmod-nvidia driver on my DELL Inspiron 2650. After that, I can't shut down my machine normally. Whenever I type "halt" in terminal or click the "shut down" icon in gnome, I get a whole black screen on the monitor and the system does not turn off.

Moreover, when I turn on my computer, after displaying texts, ramdom lines are shown on my monitor until the picture "Nvidia beta driver" is shown.

I don't know why and how to fix it. Would anyone like to help me?

My computer's display core is Nvidia GeForce 2 GO.
Below is my xorg.conf

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 1.0  (buildmeister@builder3)  Wed Sep 20 16:57:11 PDT 2006

Section "ServerLayout"
	Identifier     "Layout0"
	Screen      0  "Screen0" 0 0
	InputDevice    "Keyboard0" "CoreKeyboard"
	InputDevice    "Mouse0" "CorePointer"
EndSection

Section "Files"
	RgbPath      "/usr/X11R6/lib/X11/rgb"
	ModulePath   "/usr/lib/xorg/modules/extensions/nvidia"
	ModulePath   "/usr/lib/xorg/modules"
	FontPath     "unix/:7100"
EndSection

Section "Module"
	Load  "dbe"
	Load  "extmod"
	Load  "type1"
	Load  "freetype"
	SubSection "extmod"
		Option	    "omit xfree86-dga" # don't initialise the DGA extension
	EndSubSection
	Load  "glx"
EndSection

Section "ServerFlags"
	Option	    "Xinerama" "0"
EndSection

Section "InputDevice"

    # generated from default
	Identifier  "Mouse0"
	Driver      "mouse"
	Option	    "Protocol" "auto"
	Option	    "Device" "/dev/input/mice"
	Option	    "Emulate3Buttons" "no"
	Option	    "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"

    # generated from data in "/etc/sysconfig/keyboard"
	Identifier  "Keyboard0"
	Driver      "kbd"
	Option	    "XkbLayout" "us"
	Option	    "XkbModel" "pc105"
EndSection

Section "Monitor"

    # HorizSync source: edid, VertRefresh source: edid
 ### Comment all HorizSync and VertSync values to use DDC:
 ### Comment all HorizSync and VertSync values to use DDC:
	Identifier   "Monitor0"
	VendorName   "Unknown"
	ModelName    "Nvidia Default Flat Panel"
 ### Comment all HorizSync and VertSync values to use DDC:
	HorizSync    29.0 - 49.0
	VertRefresh  0.0 - 60.0
	Option	    "DPMS"
EndSection

Section "Device"
	Identifier  "Videocard0"
	Driver      "nvidia"
	VendorName  "NVIDIA Corporation"
	BoardName   "GeForce2 Go"
	Option	    "AddARGBGLXVisuals" "True"
EndSection

Section "Screen"
	Identifier "Screen0"
	Device     "Videocard0"
	Monitor    "Monitor0"
	DefaultDepth     24
	Option	    "metamodes" "1024x768_60 +0+0"
	SubSection "Display"
		Depth     24
		Modes    "1600x1200" "1280x1024" "1024x768" "800x600" "640x480"
	EndSubSection
EndSection

Section "DRI"
	Group        0
	Mode         0666
EndSection

Section "Extensions"
	Option	    "Composite"
EndSection