I find SuperAntiSpyware OK. As ever you can get some good recommendations and reviews here (e.g. under Security for antivirus/antispyware/firewall utilities).
Yes - but the topic in hand is anti-spyware and Avira (free version) does not cover that. See [broken link removed].
Avira AntiVir Personal Edition is my top pick if you're looking for the best protection against viruses. It is very light on resources and the detection rate of viruses and rootkits is outstanding, however, there are some reservations. First, it does not include antispyware protection or e-mail scanning, they are only available in the paid version.