I have Norton Internet Security 2005 regularly renewed.
Under Systen Status I get the warning Urgent Attention - "Your virus definitions are out of date.Run Live Update for the latest virus protection up dates"
I have run Live Update many times but still get a red warning that my virus definitions last updated 28 August 2010.
I have the feeling I must have deleted some "definitions" by mistake when clearing out a lot of temporary files on my hard drive.
Is there anyway I can download the complete set of current virus definitions?
An added advantage of using the 2011 version is that you can UPGRADE to the LATEST version for FREE at http://www.norton.com/nuc". Those using NIS2005 and older are not eligible.
Requirements for Norton Internet Security 2011
Operating Systems Supported
Microsoft® Windows® XP (32-bit) Home/Professional/Tablet PC/Media Center (32-bit) with Service Pack 2 or later
Microsoft Windows Vista® (32-bit and 64-bit) Starter/Home Basic/Home Premium/Business/Ultimate
Microsoft Windows 7 (32-bit and 64-bit) Starter/Home Basic/Home Premium/Professional/Ultimate
Minimum Hardware Requirements
300 MHz for Microsoft Windows XP, 1 GHz for Microsoft Windows Vista/Microsoft Windows 7
256 MB of RAM
300 MB of available hard disk space
CD-ROM or DVD drive (if not installing via electronic download)
Support for Antispam
Microsoft Outlook® 2002 or later
Microsoft Outlook Express 6.0 or later
Windows Mail (spam filtering only)
Browser Plug-In Support***
Microsoft Internet Explorer® 6.0 or later**** (32-bit only)
Mozilla® Firefox® 3.0 and later**** (32-bit only)
Email scanning supported for POP3-compatible email clients
But if you use Windows XP (SP3) or later, as others wrote before, it is advised to use a newer version. If you use an older Windows version, you should check which Norton product is the latest one that works with your Windows version.
I suggest you to follow PapauZ's post. In addition to that, you need to make sure that the system date and time are correct. Also, there is one more tool "PiUpdate" that we can try. Here is the KB: