At a Glance
SpywareBlaster protects you by adding the URLs of risky sites to your browser's Restricted Zone, preventing malware from installing. The program doesn't scan or work in the background, but for a $10 registration, it will automatically download Restricted Zone lists.
The only downside, and it doesn't happen often, is that the tool may lock out a site you visit. Just remove the site from SpywareBlaster's list.
Note: This program is donationware. It is free to try, but the author accepts and encourages donations towards further development.