Messed up my desktop. Need to reinstall compiz and desktop effect

[jobbe]

Since i messed everything in compiz, I lost compiz itself, I lost desktop effects and I can't reinstall compiz and desktop effects, is there a way to restart from cd and reinstall only these packages? Or any other good way?
I'd like to do like this because everything else is working fine on my system
Thanks a lot in advance

[ryptyde]

Login as root and see if anything works there and you can create another user account and then login and run from there if you can until you can sort out your Compiz desktop-effects problem.

[jobbe]

I prefered to reinstall ubuntu from scratch, but I'll write down on a file your advice, who knows? I could even do the same mistake