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Have you updated a Graphic driver? Does it Dim on battery and AC? Look at power settings. Control Panel, Power. You could Rool-Back the graphic driver to see if that changes the problem. A Gateway mt6841 has Windows XP OS, right?
nvlddmkm.sys is nvidia graphic card driver files, first off download latest driver form nvidia official site..get it here...use drop-down list to fill the model of your graphic card and OS.. If you can not boot from your system normally you can enter to safe mode instead, then remove all previous nvidia drivers that installed on your laptop, also you can do manually remove nvidia installations folder include 'nvlddmkm.sys'..You have need to restart your laptop to make changes then install new driver you have already downloaded...
Download it according to the Operating System installed and Installed it and your VGA will work fine now.
If you are not able to play a particular video file format, Then install VLC player, it will play anything.And if you want to use your Windows Media Player to play most common format files then download Windows Essential Codec Pack.
Here is the link for VLC Player. http://fs3.filehippo.com/3389/929c24d32e05459db04905bf635b26a9/vlc-1.0.3-win32.exe
Here is the link for Windows Essential Codec Pack http://www.mediacodec.org/WECPSetup.exe
if you are unable to intall the graphic driver,it may be that the driver you are using is not compatible with the laptop.what i will advice you to do is toget the real driver for the laptop and reintall the operating system again and try running the driver, because at times when drivers that are not the real driver for the machine is being use when you try running the real driver it might no go because you have try intalling the wrong driver several times.
You've got graphic rendering problem bcos, the webcam drivers installed in your laptop don't work correctly. ie) the driver installed forces your webcam to take a snapshot at a resolution that is not supported by the webcam hardware...So, tell me ur laptop model number and I'll let u know abt the drivers....