Some of you might find this helpful.

Lavasoft product download is available at http://www.v3.co.uk/vnunet/downloads/2213414/ad-aware-plus

Includes updates for 1 year, offer expires later this evening I believe.

If you have something like Norton or McAfee I highly recommend grabbing this instead. All you have to do is create an account, just need an email address.

Microsoft Security Essentials is actually really fantastic and light on system resources. I used to use Avast! or Avira which are both good products but MSE is lighter on resources. Which surprised me because I've been disappointed with their security software in the past.