VirtualBox disappears, tar.bz2 files won't install

I installed VirtualBox on my Acer Aspire 4520 laptop running on openSUSE 11.1. I had nothing against this OS till now.I was real proud of the fact that i got VirtualBox working on linux. But now, everytime I open VirtualBox; all i see is busy sign and nothing… I really need it for my college project.
please help!!

is there any other way to compile .tar.bz2 files than the terminal?

open a terminal and go su

then do this

/etc/init.d/vboxdrv setup


modprobe vboxdrv

N.B. archives need to be extracted first then open a terminal in the dir and compile from there