ntsys.sys

hi all. i need some help here.
i've installed Style Xp 1 before install SP2. Then
windows told me that syle xp 1 is one of the amount
software that not compatible yet with thw sp2. when i
reboot my xp after i installed sp2, i got a message "...
ntsys.sys is missing or corrupt, use cd installer and
choose repair ...(more or less the message is like that).
and the problem is, where is the web that to get
authentic ntsys.sys? or i can edit it by may self, how?