Turn off the computer, then hit the power button to turn it back on and immediately start hitting the F8 key repeatedly until you see SAFE MODE. Take the Safe Mode With Networking option (this will give you internet connectivity) and let it boot up. Safe Mode will look different to you, the screen will be darker and the icons bigger, this is normal. Uninstall AVG then reboot and see if you are ok. Download and install Microsoft Security Essentials as your antivirus program.
If you still get the blue screen, Try running the Check Disk Utility.
To run the check disk utility you will need a repair disc or a operating system disc. Put the disc in the cd drive and boot from it. You want to get to the Dos Command Prompt (Black screen with white letters) and type the following command: chkdsk /r Check disk will run well over an hour or two and you will notice the percentages going from high to low, this is normal. Let it run to completion. Then reboot machine. If check disk fails to solve your problem you might have to reinstall windows. Try doing a Repair Install that way you don't loose your data, documents, music, pictures, videos or programs. In windows xp you get to the dos command prompt by selecting R for repair when the options appear. In Vista and Windows 7 you want to get to the recovery console and look down at the bottom of the window for the Dos Command.
click start control panel administration tools computer management device manager scroll to sound video and game controllers you might see a yellow question / exclamation? ! mark or a red X Right click to reinstall drivers
or you might download slimdrivers
http://download.cnet.com/slimdrivers-free/3000-18513_4-75279940.html
note: it will find all of your outdated drivers
this is a free driver solutions which will automatically search for and find the correct driver
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