The drivers download link in previous pages is invalid.
I searched somewhere else and finally found all drivers.
NOW they are working perfectly on my computer.
NO MORE unknown devices. " Then, nothing more just than to share drivers with all!"
Video - Radeon Omega Driver
Audio - Realtek xxx
South Bridge - ATI Catalyst (SM bus driver)
Modem - Toshiba Software Modem Driver
Direct application launch button: get rid of the two unknown devices.
PS: For the 2 unknown devices, just
go to device manager,and update their drivers from list, then search the location of the Direct application launch button, click ok, done.
although this driver works for both,you still have to do it individually.