Hi, TROOPCARRIER! Welcome! You're not the only one new to this forum -- its only been public for a few weeks.

I must say, for someone not to sharp on PC's to do a regedit, I'd say you're doing just fine.
As to the updates, please make sure that your firewall is allowing Ad-Aware access to the internet.
Next, you could try deselecting the "surpress webubdate confirmation dialogues" option in tweak> webupdate settings.
Also, check the WebUpdate configuration to ensure that you didn't inadvertently click on "Use HTTP Proxy". If so, deselect that option and try again.
If that doesn't work, close Ad-Aware, go to C:\Program Files\Lavasoft\Ad-Aware SE Personal and delete defs.ref. Launch Ad-Aware again, ignoring the error message. Try the WebUpdate again.
If all else fails, please go to
http://www.lavasoft.de/support/download/ and download the zip file, upgrade the Definition Files and run a Full System scan.
Please let us know how you make out. Thanks!