last scansion date: not ready

When I do the scansion of unit C: (standard or deepened) awast 4.6 professional not update the last scansion date in the display pannel but it show always:
last scansion date: not ready

For the antivirus program the scansion is never to do!

The first time when I have to scannig the hard disk the program to the end of the scansion has marked a run time error that I have ignored and now this message does not appear more.

I see the event log of O.S. and avast antivirus but I have not found trace of this error.

I have uninstalled and reinstalled the program but the problem persists.

Can you help me.

Thank in advance and sorry for my english very poor.

This has been explained many times before.
Please use the search option on this board before asking.

http://forum.avast.com/index.php?topic=11290

And welcome to the forum BTW!!! ;D

Thank you and sorry but I have no idea to make a keyword search in the forum…

Sorry for my english.

Best regards

Stefano