Windows XP Professional suddenly stops and a blue screen with error message appears and could not restart

When working in windows XP Professional system it suddently went off.
A blue screen appears with the following message:
"A problem has been detected and windows has been shut down to
prevent damage to your computer
IRQL_NOT_LESS_OR_EQUAL
If this is the first time you have seen theis stop error screen,
restart your computer. If this screen appears again follow these
steps.
Check to make sure any new hardware or software is properly
installed. If this is a new installation, ask your hardware or
software manufacturer for any windows update you might need.
If problem continues, disable or remove any newly installed
hardware or software. Disable Bios memory options such as caching or
shadowing. If you need to use safe mode to remove or disable
components, restart your computer, press F8 to select advanced start up
options, and then select safe mode.
Technical information:
STOP: Ox00000000A(Ox3D8BD845,Ox00000002,Ox00000001,Ox804E9D36)
Beginning dump of physical memory.
Physcial memory dump complete.
Contact your system administrator or technical support group for
further assistance"
With this message the system stops functioning. I could not restart.
After this the system stops booting. It starts functioning again if I
switched off the system and reboot it again after 30 minutes. I am
terribly confused and irritated. Please help me to come out of this
mess.

.

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