I have run my computer scan (Win XP) with freshly installed AVG build 4259.
It has detected 1 file infected: "Inline hook ntkrnlpa.exe...". The file was not removed or healed.
Then I downloaded and scanned my computer with Microfsoft Safety Scanner (version, 1.0.3001.0, under scanning option "scan selected directory". I scanned so the directory which contain suspected file 'ntkrnlpa.exe'). It did not detect any virus, spyware, nor any other kind of undesirable potentially software.