virtualbox.org

After I upgraded my OS to El capitan yesterday, I can't open a session.
The detailed the error message is as followed, Please help me.

Result Code:
NS_ERROR_FAILURE (0x80004005)
Component:
Machine
Interface:
IMachine

Kernel driver not installed (rc=-1908)

Make sure the kernel module has been loaded successfully.

Try to re-install VirtualBox.

Thanks, but it means all my previous data are gone ?

No it doesn't. Data is one thing. A program that uses that data is another. Even in OSX upgrades you don't lose your data.

However, I try to re-install my original version-4.3.24 of virtualbox, it ends with unsuccessful installation.
Do I need to re-install the latest version ?

Appreciated

Oh dear, you were on 4.3.24! Oops, I didn't realize it (not that you told me ).

Yes, you should definitely go with the latest and greatest (5.0.20 as of this writing). El Capitan is not even a year old (2015-09-30) and the closest VirtualBox version that came after that was 5.0.6 (2015-10-02). After each release there were more and more El Capitan fixes. So, definitely 5.0.20.

BTW, which OSX version did you upgrade from, if you don't mind me asking?

It works, thanks a lot.
The OS I upgraded from is some version of Yosemite, sorry I can't remember.