It seems I am not the only one having problems with Ad-Aware. I found (eventually) the below on the Lavasoft site. I am taking the easy option and depending on SpyBot and A-Squared to find what Ad-Aware would have, and start reusing it again when they sort out the update problem.
From Lavasoft:-
We are currently experiencing problems with our definition file updating service for customers using certain Internet Service Providers (Earthlink, for example).
The problem produces the Ad-Aware SE warning: "Error retrieving updates" when performing a webupdate. It interrupts at 5% download completion .
(If your update stalls at another point than at 5 %, your problem stems from another issue.
See
http://www.lavasoftsupport.com/index.php?showtopic=1336 )
The update problems are a result of expired DNS records for our previous definition update servers. Now, some Internet Service Providers DNS servers are routing erroneous domain requests to a custom webpage, rather than to the standard The domain you requested could not be found 404 error page. This stops our updating service from functioning .
We are currently resolving to fix this problem and have contacted the ISP:s in question.
As a temporary solution, you can reconfigure your DNS settings.
Check with your ISP (website FAQ:s or support) and find out if they provide any alternative DNS server addresses and instructions how to configure this.
(If you are using a router, you may need to change the DNS settings on the router.)
If you use Earthlink as ISP (or Earthlink owned ISP:s) you can try this solution (provided by Earthlink) for working your way around the problem:
http://kb.earthlink.net/case.asp?article=187117There is a few 'Related Articles' at the bottom of the webpage, how to manually specify DNS information, for various operative systems and ADSL modems.
The following link includes a list of other Earthlink owned domains.
http://kb.earthlink.net/case.asp?article=28968Thank you for your patience as we endeavor to solve this web update issue