Dave
Log Name: System
Source: Microsoft Antimalware
Date: 03/05/2015 06:46:21
Event ID: 2001
Level: Error
Description:
Microsoft Antimalware has encountered an error trying to update signatures.
New Signature Version:
Previous Signature Version: 1.197.1227.0
Update Source: Microsoft Update Server
Update Stage: Install
Source Path: http://www.microsoft.com Signature Type: AntiVirus
Update Type: Full
User: NT AUTHORITY\SYSTEM
Current Engine Version:
Previous Engine Version: 1.1.11602.0
Error code: 0x80070643
Error description: Fatal error during installation.
I suggest you uninstall and reinstall Microsoft Security Essentials.
Select the keyboard shortcut Windows Key + R, type Appwiz.cpl and press the ENTER key. Place the cursor on Microsoft Security Essentials, right click and select Uninstall from the drop down menu. Restart your computer.
How to manually uninstall Microsoft Security Essentials if you cannot uninstall it by using the Add or Remove Programs item:
http://support.microsoft.com/kb/2435760/en-gb
Restart the computer, download, install, update definitions and run a complete scan with Microsoft Security Essentials:
http://www.microsoft.com/en-gb/download/details.aspx?id=5201
I can see nothing in the logs suggesting that there is a pressing need to update the BIOS.