I found out how! :D
when you enter guest mode, you can create another account (this is needed since guestmode cant access root priviliges (at least it prohibites me) )
i created a new administrator account ( i think it will work as well with a normal one, but just to be sure )
you can create this account just by accessing the system settings.
you login into you new administrator account, open the terminal and type "gksu nautilus"
(maybe it works with just nautilus, but im not sure if you can access other users files without gksu)
in nautilus, navigate to /home/username/
then delete the .profile file.
rename ".profile (old)" to ".profile"
and my problem was fixed :D
(this was just my thingiee.. but you can also open, edit etc the file or restore it from a backup.)
thanks for the views
hope my little mistake can help others with similar problems :)
at least i learned some :D
k thx bye ! :P