To: ntanzob
Try complete reinstalling of AVS Video Editor.  Instructions below: 
1. Go Start > All Programs > AVS4YOU > Uninstall. 
2. Go Start> Run... Print regedit in the opened window and click Ok. In the opened Registry Editor window please find and delete all AVS4YOU folders: 
HKEY_LOCAL_MACHINE > SOFTWARE > AVS4YOU (delete it). 
HKEY_CURRENT_USER > SOFTWARE > AVS4YOU (delete it). 
3. Go Local Disc (C:) > Program Files > AVS4YOU (delete it). 
Go Local Disc (C:) > Program Files > Common Files> AVSMedia (delete it). 
Download the latest version from the link below: 
http://www.avs4you.com/Downloads/AVSVideoEditor.exe
Now install the program anew on your PC. 
Please Inform about the results.