So, I had to reinstall my GTA after restoring PC. I have had this problem before and had my friend fix it for me. Unfortunately he passed away a few months ago in a car accident and now have no one to assist me with my gta. He was my go to guy for gta (RIP Rob) But the lag is that it kind of resets me when driving or moving fast. Any help is appreciate much, Thanks!

Do you have a legal copy of GTA IV? 

Yup I do. Bought from BestBuy.com Digital Library for 19.99

By the way you helped me on last problem and thanks, nice to see someone is always around :)

I never had that problem but all I did was turn off shadows and the shadow resolution and there is no lag for me anymore.

Ill try that and what is the reccomended Vehicle density and all those slider bar options. I know that there is preferred numbers from when I used to play this all the time and I forgot what it was. Thanks!

Yep, decreasing in-game graphics settings will always help. 

I decreased and made it to where PC runs for performance. Still nothing.

Try using this commandline by creating a file called "commandline.txt" in your GTA IV folder and add the following lines:

-novblank -norestrictions -percentvidmem 100 -novsync -frameLimit 0 -nomemrestrict

Ok, Can I throw this in with my existing commandline. All it is is -windowed

 

Yes you can :)

Thanks, It helped SO Much. But its still there. I was able to run it on high setting with NO lag before the restore. Anything else I can do? Also, My LCPDFR isnt working, it has an error message pop up saying there was an error.

Thanks, It helped SO Much. But its still there. I was able to run it on high setting with NO lag before the restore. Anything else I can do? Also, My LCPDFR isnt working, it has an error message pop up saying there was an error.

Have you changed any hardware recently?

I can't really help you unless you say what the error is. 

How do I go upon getting the log for you. And no I have not.

You should attach any .log files from your GTA IV directory. 

This was the only one I had

Could I see a screenshot or filelisting of your GTA IV directory please? 

This is my directory http://gyazo.com/ba603135c6f629307f0dccbaf31602b4

Alright. Could you use the manual installation package for LCPDFR 1.0? 

That is the one that was used for it. Should I try automatic instead?

No, then you should be all set. I'll be looking into this, but it is getting close to 4 am here, so I will get back at you.