Moved to proper forum for quicker and more responses.
The same CD doesn't work with my computer - but now i tried it with my notebook and there it works fine.
So thank you for your time and sorry for bothering you.
Should have thried that before - now I hope it works with the computer I made the CD for.
Could be the drive is bad, try another drive with that computer or try a USB Flash Drive and install UBCD to it.
Visit the UBCD Wiki: http://wiki.ultimatebootcd.com
Please check your UBCD
ISO MD5 Hash Sum
; May prevent issues later on by not having an exact copy.
Currently Working on Common Issues and Repair Tips
on the Wiki.