Eset detecting itself as a virus

I upgraded a few of our laptops to 4.2.67 and ESET is now detecting its own components as a virus:

12/6/2010 9:40:23 AM - Module Real-time file system protection - Threat Alert triggered on computer xxxxxxxx: C:\Program Files\ESET\ESET NOD32 Antivirus\Mozilla Thunderbird\Components\eplgTb.dll contains a variant of Win32/Kryptik.AMQ trojan.

Once this happens I lose internet access and have to reboot to get things working again.

 

It sounds like a real infection. Kryptik.AMQ is a quite old signature and it's likely to be detected on files that have been tempered with. The best would be if you could some examples along with a SysInspector log to ESET for perusal (instructions for submitting files are available here).

 

The laptops were running 4.0.x before with no detections.

 

V. 4.0 didn't have a plugin for Thundebird.