For regular applications you won't notice a difference but in games, definitely.
to improve the video and graphics capabilities of your computer
No. The brightness is determined by your monitor. While you can artificially increase the white balance with the better graphics cards, this will not solve the problem. You'll have to get a higher brightness monitor.
configure the application to run correctly with the new graphics card
You cannot but if on computer it might be better if you have a graphics card.
Installing a new graphics cards does not necessarily mean that something will appear better. First of all, the number of colors a graphics card can output is already higher than the number the human eye can actually distinguish, so static images will never appear any better (though a better monitor may reduce glare and make them appear more clear). As to why the graphics in a game will appear the same, if the game does not use any additional shaders or textures that the card provides over your old one, the game will obviously look the same.
you can normally get updates from Microsoft or you should have a dick that came with the graphics card that should let you install the drivers
The Radeon graphics cards are some of the best available. The card will improve the apperance of your games.
Installing graphics card is fairly simple and only requires a minumum knowledge of computers to accomplish. Just look online for an easy to follow tutorial.
Once it happened to me when I didn't install motherboard.Or it can happen without installing graphics card.
The computer has a graphic by the graphic card, (video card) the better one you have the better graphics you have. HD 3550 is better than HD 750. So more the number on the graphics card the better yours is. Or it might be in the option and turn up the graphics. It might lag if you have a ok one, but turn down if it starts to lag. And eventually you can find one that suits your graphics card.
regardless of the motherboard and the graphics card type, installing a graphics card is standard. You need to find the pci express 16 slot on the motherboard. It should be the largest of the pci slots, and if you cant find them, you shouldn't be fiddling around inside your computer! Take out the metal cover on the case so it fits, and slot the card in until it clicks into place. Then start up the computer and install the graphics driver off the CD
Turn them on High. Other than that buy a new graphic card.