I have a IBM laptop which didn´t come with a separate XP CD. The software is pre-installed on a safe spot on the hard disk. When needed, reinstalling is done through a special process over the blue Access IBM button.
How do I go about when building the UBCD4Win CD?

Michiel,

the safest way will be to ask IBM for a Windows XP CD. Some years ago, companies had an obligation to give a Windows CD upon buyer request. I don't know if this is still true.

Daniel

I don't know if this will work, but maybe you could use free data recovery software like PC Inspector to recover the os to another part or the drive or another HDD.

Thanks guys,

Well I solved it different and used my fathers CD. After all it was his computer going down!