Open the Avira window by double-clicking the icon in the sys-tray. Click the “Local Protection” link and then “Scanner”. This allows you to do some configurable scans. It’s not fully configurable, but it has most of the sensible options like Local Hard Disks and Windows System Directory. Once you select the type of scan you want, click the little magnifying glass icon with a red thing on it. It says “Start Scan” if you hover over it. Make sure you update your definitions before doing the scan. Also, close as many programs as you can while scanning. And delete temporary internet files if you scan a Documents and Settings folder. Cheers.