I have figured it out and I'll give a short outline of what I did because that is what I myself was looking for:
OK First I activated Telnet on my PC
To enable Telnet command line utilities:
1. Click Start > Control Panel.
2. Click Programs and Features.
3. Click Turn Windows features on or off.
4. In the Windows Features dialog box, check the Telnet Client check box.
5. Click OK. The system installs the appropriate files. This will take a few seconds to a minute.
Now open a CMD (command) window with Admin rights (right click and open with admin rights) (That's what it's called in Dutch, not sure 'bout English)
On your scope find out the IP address by going into 'Utilities > IO settings > LAN configuration
Now on your PC type in the Command Window: telnet xxx.xxx.xxx.xx 5555 (the xxx's are the scopes IP address)
Check if you got a good connection by typing '*idn?' (without the '' )
If you get your scopes make and serial number in return you've got a good connection
Now type: ':SYSTem:AUToscale ON' (without the '' and beware the space before the word ON)
That's it!! Job's a fish!!
I hope this helps other people out. Thank you.