virtualbox.org

Hi every1!
I have been trying to install virtual box but windows says:
this can... bla bla bla... make your computer unstable, now or later... may not be compatible with XP.

Is it bull**** or is it so that it can destroy my computer?
I'm a bit confused here...

VB installs an unregistered device driver. Device driver registration is a bureaucratic lab process that MS inflict on vendors to get registration. It's a bit of a problem if you are releasing a new version every few months. IMHO, no, VBox doesn't make XP unstable.

ok thanks!

How do i remove an virtual machine?

From the GUI. There is a button with the text 'DELETE' on it. Select the VM you want to remove and hit that button. It might ask about the VDI too, but if it doesn't, go to the Virtual Disk Manager and remove it from there.