DNS Attack

[Montegue]

Any techies explain this please "04/04/2008 23:29:03 Detected DNS cache poisoning attack 192.168.1.254:53 192.168.1.64:57373 UDP"
*Note: had 5 instances of the same in 7 seconds and had none since.

Also if anyone has a clue about why would an "svchost.exe" try to change itself. NOD32 sprung up alerting me to this and told me to deny it (which i did) Upon that I did a full InDepth virus scan and all is totally clean.

Im using Vista 32, never experienced anything like this before on XP or prior OS's, only had the system from new for about 2 week or so. I have also just gone to OpenDNS after the full scan, something that I forgot to do when I received the system. Don't know if that would help but surely can't hurt.

Thanks

 

[AbsenceJam]

Just ignore it, firewalls are paranoid.
As for svchost.exe that's a wrapper for a variety of services so it could be anything that you've just updated. Use process explorer if you want to see what every instance actually is.