360 is your preferences file is corrupt or repair method:
1. Right-click the desktop browser icon select Properties, select Find Target
2, where the file into the folder browser, enter the parent directory
3, enter user data folder and then into the Default Folder
4, delete the folder in the Default File Preferences
5, re-enter the 360, the world clean
6. Finally, the reason is very complex, not on the line, do not ask why
Search all 360 browser after uninstalling the browser 360 in the registry key after you remove re-download and install.You can change the installation disk.