Can it run on mine? Im not pretty much sure coz when I play Assasins Creed in DX9 there are times that are laggy.  
Here's my specs: 
Processor: Core 2 Duo E7400 @2.80GHz 
RAM Memory: 2048mb' 
O.S. Microsoft Windows XP Professional (but when I right click MY COMPUTER, it says there "Windows XP Ultimate - Service Pack3 v.5755) 
Is my O.S. correct? I didnt install my OS so I have no idea if it is XP Pro or SP3. 
Display: GeForce 9400 GT 1024mb 
Can it run?  
BTW, my friend hooked me up with a pirated GTA IV discs. It ran on his Vista. but when I was trying it an error occured saying: 
"autorun.exe is not a valid Win32 application" 
"setup.exe is not a valid Win32 application" 
Coz if it will work on me I would buy the original copy coz its worth it and save the trouble of buying an xbox 360 for the sake of GTAIV.  
How can I fix this? (Is this fixed by changing my O.S.?) 
Or will GTA IV run in 32 bit OS? 
thanks, Im a newb.