Additions disappearing

[kappolo]

Hello Everyone,
I have a problem installing guest additions on CentOS (5.4 and 5.5) on VBox PUEL on Windows 7.
Basically I install the guest additions and they work perfectly for that session and when I reboot the guest OS.

But if I reboot the host OS the Vbox additions they disappear.

Code: Select all

su -
lsmod | grep vbox

nothing is appearing.

Any suggestion how to fix that?