When you say that you cannot summon another, is it because you do not get another chance to cast the spell?? I am not playing a wizard, so I don't know what is involved, but have you tried justifying yourself to do the cheat command to make another "summon familiar" scroll?

Can anyone help me...
in chapter 1 i summoned a familiar, but it dissapeared and now I cannot summon another, says that i allready have a familiar.. but i dont???

If you haven't left chapter one yet then it's most likely location is near one of the portals. For some odd reason mine disapeared there to for a while. Cheers

I have left chapter 1... currently in chapter 2... on my way to stop the invading orks....

Have you tried to put your familiar into your pocket before you leave Irenicus' dungeon?

It was in my pocket/backpack but it dissapered suddently... no quest items recived either

Hmm ... It sounds like you have a bug to report.
*starts dreaming of the days when games were shipped bug-free*

No... When i try it just says that i allready have a familiar summond....

Familiars aren't that great mine always died so kept him in my pocket anbd he never came out i just used him for the extra hitpoints

And what is a familiar?