Graphics problem with Gta IV

hello,

This is my config

1. Ati radeon hd 4870
   
2. Processer intel core 2 duo E8600 3.33 GHz
   
3. 2 gigabytes of RAM
   
4. motherboard Asus p5q3 delux
   
5. vista 64 bit home edition

I installed GTA 4 and games run smoothly with fine graphic elevated by resolution of 1440x900.then after that I install the latest drivers for the Radeon.my graphics card after installing drivers Game starting Lagging even if set 800x600 resolution and run in windowed mode.the problem remains Always the same. What Should i Do pls Help Thank in Advance

The Solution is Simple Why Dont You try Uninstalling the Drivers You installed recently this Problem might be to Bug in Drivers so try unstalling Driver or better Roll Back your Drivers this way you dont have to again reinstall your drivers

But How Do We Roll back drivers so This Way i do not have To install old drivers can you please tell me ? thanks for your reply and thanks in advance

Shortly after updating a driver for one of your devices, you visit that it is not working as it should. You can very simply to return to the previous driver for this device.

Here's how:

1. Click Start, Control Panel and then click System
   
2. Then click on hardware and then Device Manager
   
3. Select the device for which you want to return to the previous version of the driver and then right-click and go to properties
   
4. Select the Driver tab and click Return to the previous version.

Change your graphics detain option of this game.