What to do if your antivirus program won't update!

If your antivirus program fails to download the latest virus signatures, a virus might have stomped on your Internet connection. When this happens a virus has modified the windows HOSTS file. In Windows XP and Vista you can locate the HOSTS file by going into the C:\windows\system32\drivers\etc. This File can be opened with notepad or another text editor. It contains comments that begin with characters #-- these can be left along. the HOSTS file should contain only one other line:
127.0.0.1 localhost
In Vista, you will also see this line at the bottom:
::1 localhost
Any other lines of text can be removed.
After editing it, save the file and close it. Now try to update your antivirus program. It should work.