You have just been struck by the Blue Screen of Death. 1 Hardware conflict The number one reason why Windows crashes is hardware conflict. Each hardware device communicates to other devices through an interrupt request channel (IRQ). These are supposed to be unique for each device. For example, a printer usually connects internally on IRQ 7. The keyboard usually uses IRQ 1 and the floppy disk drive IRQ 6. Each device will try to hog a single IRQ for itself. If there are a lot of devices, or if they are not installed properly, two of them may end up sharing the same IRQ number. When the user tries to use both devices at the same time, a crash can happen. The way to check if your computer has a hardware conflict is through the following route: * Start-Settings-Control Panel-System-Device Manager. Often if a device has a problem a yellow '!' appears next to its description in the Device Manager. Highlight Computer (in the Device Manager) and press Properties to see the IRQ numbers used by your computer. If the IRQ number appears twice, two devices may be using it. Sometimes a device might share an IRQ with something described as 'IRQ holder for PCI steering'. This can be ignored. The best way to fix this problem is to remove the problem device and reinstall it. Sometimes you may have to find more recent drivers on the internet to make the device function properly. A good resource is www.driverguide.com. If the device is a soundcard, or a modem, it can often be fixed by moving it to a different slot on the motherboard (be careful about opening your computer, as you may void the warranty).
BSOD or so called, Blue of screen death occurs due to variety of reasons and once it do, you might have to force restart it to use your PC again. Old drivers, outdated windows, faulty hardware, degrading hard drive etc. are one of the top most reasons that causes bsod errors.
If you're not a pros or just a basic PC users, I'd recommend you to take your PC to any nearest computer repair shop and get it resolved there.
I'd glad to address if you've any further queries.
Did u started getting the problem after changing any hardware like mother board? If so then the problem might be with your motherboard or the hardware because hardware conflicts cause the computer to crash.