NT messages are OK on XP - it is based on NT.
It appears that this is a firewall message saying that something has changed this file: C:\WINDOWS\system32\ntoskrnl.exe since the last time that you used it. It is a core file for Windows and it's important that you be sure that nothing bad has corrupted it.
Notice that the source and destination belong to the same network: Source: 18.104.22.168
A reverse DNS search shows this to be located here: Argentina [City: Buenos Aires, Buenos Aires] and that the addresses are owned by: http://www.lacnic.net/
UDP Port 138 is used for NetBIOS name resolution.
If these IP addresses are a part of your local network, I'd suspect that you have a NetBIOS problem. Removing and reinstalling the NetBIOS protocol might help.
My browser caused a flood of traffic, sio my IP address was banned. Hope to fix it soon. Will get back to posting as soon as Im able. - John
(my website: http://www.carrona.org/
)**If you need a more detailed explanation, please ask for it. I have the Knack
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