my computer doesn't recognize my video drive and it's asking to install it.but yesterday is was fine what do I do?

What exactly do you mean by "video drive"? Are you talking about your DVD drive, or do you mean the driver for your graphics card?

graphics card.and it's not onboard

Uninstall the existing drivers (they probably exist, Windowsjust isn't recognizing them, so you may have to go into either the Control Panel and add/remove programs to find the drivers, or if you're comfortable with it hack your registry) and then download and install whatever the newest version of those drivers is.

Well, have you tried to install the latest drivers then? Sometimes, drivers just fuck up for no discernible reason. Reinstalling them might be all you need.

Uninstall the old driver, install the latest driver for the card, try again.

What graphics card are you using?

Is your machine set to automatically update video drivers (an aborted automatic update might cause the effect you're describing, though there are many other possible reasons as well).

Uninstall the drivers in programs & features in the control panel. When it asks if you want to restart dont.

Go to :

http://www.phyxion.net/Driver-Sweeper/Driver-Sweeper/Version-3-2-0/

Download and install Driver Sweeper.

Run Driver Sweeper and analyse then clean all the stuff related to your Graphics card. Its literally a 1 click thing here. If ATI just put a tick in ATI, same goes for Nvidia. What this great little program does is completely remove all the stuff the uninstall leaves behind. So you wont get version conflicts etc. It gets rid of all the stuff Windows likes to hold onto with drivers. Effectively its like installing a new VGA card for the first time and Windows not knowing what it is which is where you need to be.

Then grab the latest driver for your graphics card. Make sure you get the correct version for your Operating System, 32 bit or 64 bit etc. To check this go into System in the control panel and it tells you exactly what you are using in terms of OS. (I am assuming you will be using Vista or Windows 7 here)

Now I would do the restart and once windows boots up let it install the basic windows VGA driver. Once that is done run the setup for the driver you have just downloaded and follow onscreen prompts including the restart when complete.

That should sort it out for you :)

Best to download latest driver then uninstall old driver and try installing new one hopefully fix the problem.

nothing is working.I tried to install the latest driver but it says that it didn't found a graphics hardware.what do I do?I'm getting really worried.
and I unistalled the old driver

more info, how old is the card? how long did it work?
have you opened up your pc and checked your card (like any dust gathered)

could try setting back your system settings to a few days back.

it's the 6 series.and I just picked it of maintenence

Sounds like you might be trying to install the wrong drivers for it as that error usually comes up when using the wrong drivers. You could try using 3rd party drivers such as Omega if the official ones don't work: http://www.omegadrivers.net/

I would try opening your case and actually making sure it is seated correctly in the slot on the motherboard. Also, if your motherboard does have onboard graphics make sure you have disabled it in the bios.

it did not worked.I still can't play my games without getting the error message that no graphics driver was found

You might want to check if your graphic card is still in order and working. I had mine break down without really realizing it once, because the PC was using the onboard card instead. I take it your monitor is still connected to the card? What does the control panel say about your video card? Does it still display its name or just "Standard VGA"?