windows error

I turn on my com one day it booted as normal then then about half way thought loding win xp home it did this


A problem has been detected and windows has been shut down to prevent damage to your computer.

UNMOUNTABLE_BOOT_VOLUME

If this is the first time you've seen this stop error screen,
restart your computer. If this screen appears again, follow these steps:

Check to make sure new hardware or software is properly installed. If this is a new installation, ask your hardware or software manufacturer for any windows updates you might need.

If ploblems continue, disable or remove any new hardware or software, disable bios memory options such as caching or shadowing. if you need to use safe mode to remove or disale components, restart your computer, press f8 to select advanced startup options, then select safe mode

Technical information

*** STOP: 0x000000ED (0x81F86590, 0xc0000006< 0x00000000, 0x00000000)


Can you help me :angry2: