Updates not digitally signed??

Curious problem... I've got two computers - one desktop and one notebook. The desktop updates fine, but the notebook keeps reporting that the 'update is not digitally signed' and asking for confirmation to proceed, which I normally give, if I'm there to see it. Clearly, if this doesn't happen (no-one present to confirm) then the update is rejected. I'm guessing that the digital signature check is something to do with a setting on the notebook, but I've checked everything I can think of and I can't find anything that could create this effect. Can anyone help track this down?

Just for the record, here's the set-up:

NOD32 antivirus system information
Virus signature database version: 1.1826 (20061023)
Dated: 23 October 2006
Virus signature database build: 8256

Information on other scanner support parts
Advanced heuristics module version: 1.038 (20061019)
Advanced heuristics module build: 1123
Internet filter version: 1.002 (20040708 )
Internet filter build: 1013
Archive support module version: 1.050 (20060926)
Archive support module build version: 1176

Information about installed components
NOD32 For Windows NT/2000/XP/2003 - Base
Version: 2.50.25
NOD32 For Windows NT/2000/XP/2003 - Internet support
Version: 2.50.25
NOD32 for Windows NT/2000/XP/2003 - Standard component
Version: 2.50.25

Operating system information
Platform: Windows XP
Version: 5.1.2600 Service Pack 2
Version of common control components: 5.82.2900
RAM: 1216 MB
Processor: Intel(R) Celeron(R) CPU 2.80GHz (2799 MHz)

 

this has happened before, try following teh instructions in this post.

if u dont want to uninstall/reinstall, go to C:\Program Files\Eset\updfiles and delete the files in that folder, then try to update again.

 

Great! Tried the clear-out and update as suggested. The update completed successfully. No digital signature message. Many thanks for your help.