1. Unregister DynamicWebTwainCtrl.dll by using the command "regsvr32 -u C:\WINDOWS\system32\DynamicWebTwainCtrl.dll".
2. Delete DynamicWebTwainCtrl.dll and DynamlicWebTwainActiveX.lic under "C:\WINDOWS\system32".3. Remove DynamicWebTwain Class at "C:\WINDOWS\Downloaded Program Files" if it exists.
