This could be a very silly question which could be put down to lack of sleep but here goes. I just started a scan and in the Scan window and was informed that the "Version of virus signature database used:" is 3495 (20081004). When I hover my mouse over the Nod icon it informs me that the virus signature database version is 3505 (20081008 ). So why is the scan using an older virus signature database version and not the most recent? Sorry if this has been asked before. I did a search first and could not find anything that related to this.