lf85

Well, it's not "crap" depending of what you do with this laptop, as I said it can handle some games that are 3/4 yrs or older, but only if they are not resources-hungry games.
And you can do HD video encoding as well (not at speed of light) and some other multimedia stuff. But it's clearly not a gaming laptop, and, for gaming usage, yes it's a cheap crap lol.

OMG this one ? With an integrated Intel HD3000 "graphic" card ? Well, you should forget about running GTA IV decently with this, sorry ^^
It can handle some "old" or "basic" games and video encoding, but that's all. GTA IV was poorly ported to PC and it's catastrophic even on high-end computers.
You can try to tweak a bit your system but you won't have miracles. CPU and "GPU" are too weak for a game like GTA IV.
ps : 64bit with less than 4GB RAM is a bit useless and a bit more ressource-hungry.

Turn down your in-game graphics settings; vehicle density, draw distance and detail distance.  Lower water quality to low and shadows to off.  
 
DrDetroit

What he said ^^
+ you can check this topic '?do=embed' frameborder='0' data-embedContent>>
+ about keys download this memo '?do=embed' frameborder='0' data-embedContent>>
+ with lcpdfr you can go everywhere, but if you want to unlock it completely, use a trainer, and disable keys in trainer.ini : line 574 : KeyBindingsDisabled=1
 
 
EDIT : it would be better to tell us your system specs

Did you read my post above yours ?

I don't know if it's my fault, but I don't understand anything lol
 
Anyway, check the topic I linked about low-end computers (and for your other questions, read my other links).
About system specs, you can use Speccy. We need to know RAM, CPU, and GPU.

1 - Don't use a pirated copy of the game,
2 - Install GTAIV patch 7 or EFLC patch 2,
3 - Untick "read only" on main game folder,
4 - Run LCPDFR installer as admin,
5 - Check that you have required components,
6 - Finish install and run the game as admin.
7 - If you have issues, read the Support Section & Read-First Memo.
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- If you still have issues, use title="">Diagnostic Tool and post the report.