Imovie not starting, powerpoint crash when played, graphics card/ output vga?

[dan the man with the plan]

Hello,

 

I have a gateway nv53

-4gb ram

-250gb

-amd 2.4 GHz dual core (M600)

-256 mb graphics card ATI HD 4200

-OSX 10.6.4 (im not a fan of updating tends to make me restart things all over )

 

I know I know its Amd but I haven't seen problems like this before.

- PowerPoint crashes when slides played

- I movie won't open says Graphics card not right or something

 

- and my VGA out does not work, There was something I saw called "mirror Displays" and when double clicked it magically made VGA out work (it was for a dell mini 9) but I cannot find it, Does anyone know what this is?

 

 

Thanks in advance