Hey everyone.
First, thanks everyone for your replies.
Launching the task manages is disabled and running scripts that are going to open a command prompt do not work neither. Nor command.com.
However, it seems like just displaying the shell (im not whether its the right word, excuse my english) window is disabled. I can execute the scripts, but the "shell" window only appears for about a second and is disappearing then.
If you even can't open the task manager I think you probably need an account with more privileges or think of getting more "creative".
And what would you say, is then more creative?
I can not boot from a live CD, because i cant access the BIOS settings. Sure, there are ways to work around this, like setting a jumper, but im searching for other ways without modifying the hardware.