Sometimes the Avira does 'freezing' because of the explore or context menu addition by the Avira.
This addition to the Avira features can uninstalled through the Add and Remove Programs in the Control Panel. Open the Avira in the list using the Change/Remove button and do not uninstall the avira just select the change option and there should be a list to de-select the context/or explorer scanner.
Then reboot after you are finished.
Individual files can still be easily scanned by the avira antivirus without the context menu scanner - just open the avira GUI from the tray icon and then drag and drop the file or folder to be scanned over the avira GUI. It will get scanned instantly.
Of course it could be the Avira is not quite ready yet for window 7 and does not work properly with the windows 7.
Edited by 01d5od, 25 April 2009 - 05:23 PM.
ZA Pro & Avira antivirus & SSM Pro & Privoxy & Protowall & Opera for security. Topped off with a limited user account on fully updated XP HE SP3.