Replacing Motherboard - Device Reqistry Question...

I am about to replace my system's motherboard... I do NOT
want the "Blue Screen of Death"...
Somewhere, somebody told me there was a registry 'exe'
file that I should activate before shutting down my
computer... and... that this told windows to
release/disregard attached devices.
As such, Windows XP should OPERATE after replacing major
devices...

Anyone that can help ??

Thanks,

file name: secur-reg or something ????