I can't save and preview, special characters

[Petr Simon]

HI,
I am new to emacs. I have too instalations and two problems. Both are on 
Debian, installed from packages.
1. When I try to save it says: Symbol's function definition is void: 
call-with-transparent-undo.Well in fact whatever I do gives me this, 
preview too. So I am learning emacs and latex, but can't see or use 
anything I type in.
2. on my laptop it works (saving), but I have problem with other things. 
 First of all I don't see the same toolbar as on my other computer. 
When I find file, Yatex invites me, but I dont have Command Preview and 
Latex. When I try to select LaTex command from Yatex >  Process > LaTex 
it says /bin/bash: line 1: platex: command not found. I have installed 
the ptex-bin package which should contain platex, but peoblems pertains.
3. (ok not only two problems...) I can save and then generate dvi file 
with latex. But I can do it only with English. I am sorry for this, 
maybe I can read it somewhere, but I did I wasn't really able to find 
something I could easily use. I need to get pdf or ps with lots of 
"abnormal" characters like Chinese, doubled and trippled diacritics. I 
set the environment to utf-8-unix and saved the file like utf-8-unix, 
but instead of my characters I got only little bit of mess, some of 
original even disappeared.
Can you help me please, I under pressure of time (MA thesis) and not a 
very skillful hacker ;-)
Thanks a lot
Petr