Is the computer clean inside? That would be a heat issue if not.

But otherwise it sounds like the graphics card.

Did you check your Event Viewer?

yeah well the whole clean inside i am not sure about since my computer was open for about a month now since i lost those thingys that close its side .... but how could some dust be crashin a game?
and for the event viewer i still dont get it xD

Dust creates heat and it also limits the function of fans.

What don't you get about the Event Viewer? Have you read this?

How to view and manage event logs in Event Viewer in Windows XP

okay for the dust thingy any ideas how to clean it?
and for the event viewer readin it now...
and u said b4 that if it i snot dust problem then it is heat issue whats a heat issu?

What I meant was dust would cause overheating.

When a computer overheats it will either turn off or freeze.

yeah i guess thats right cause my computer do freeze when nothin is turned on just in the desktop my mouse starts to "lag" and also it takes ages now to load xp never was like that plus it takes ages to open any program for the first time when restart what do you think?

no further ideas?

Event Viewer
--------------------------------------------------
Check your Event Viewer via Administrative Tools.

Open the System as well as Application tabs and look for red X errors that coincide with your problem. Details here:

How to view and manage event logs in Event Viewer in Windows XP

Basic information on Event Viewer errors can be found here: EventID.Net

yeah well to be honest it kinda fixed it self xD just like the system restore (previous posts)
my pc ftw
it turned out that the stupid trainin mission was the problem something was wrong in that .... i dont know it just crashed to much there... after i passed that hardly .. and started a real mission its pretty good just crashes 1 time per mission .. for me thats pretty awesome plus the game has auto save so

and by the way now when it crashes it gives the blue screen with physical memory dumb thingy
but after all i think its the graphics its like it can run it 75% but not 100% i think thats why it is not the requirment for the game

thanks for all ur helps specially in my previous posts