how to unzip .zip files with crossover

Install p7zip-full and run file-roller again.
Details of the package.
http://packages.ubuntu.com/maverick/p7zip-full

I installed p7 zip but the file roller is not starting, where could i change this ?

> file roller is not starting

What happens, any error message?
Any messages in .xsession-errors (hidden file in Nautilus)?
In case run it in a terminal and post error messages:
file-roller

I just cant open my personal folders,nothing happens,

Please be more specific and provide what you're trying to do exactly and which steps you've made before the issue occured.

Did you try to access your personal directory via places menu and it wasn't successful?
Did you try to open a folder in Nautilus (file manager) and it wasn't successful?

Please open a terminal (ctrl+T) and post the output of:
stat .ICEauthority
ls -l /home

You can also start Nautilus in a terminal by typing:
nautilus

Open the context menu of a folder with right click and verify that permissions are correctly set, you need to be the owner of the directory or file in your /home/user.

Sorry, the shortcut to open a terminal is: ctrl+alt+T

Hallo Aka Sam, the output in nautilus is;
harry@harry-System-Product-Name:~$ nautilus
harry@harry-System-Product-Name:~$ stat .ICEauthority
  File: ‘.ICEauthority’
  Size: 33096 Blocks: 80 IO Block: 4096 normaal bestand
Device: 801h/2049d Inode: 2367332 Links: 1
Access: (0600/-rw-------) Uid: ( 1000/ harry) Gid: ( 1000/ harry)
Access: 2011-02-28 19:58:47.173386983 +0100
Modify: 2011-02-28 19:58:41.432258981 +0100
Change: 2011-02-28 19:58:41.432258981 +0100
harry@harry-System-Product-Name:~$ ls -l /home
totaal 12
drwxr-xr-x 100 harry harry 12288 2011-02-28 20:05 harry

Thanks for the outputs which look ok so far.
When typing nautilus did the file manager open?

And what happens by opening which folder, what's the exact path of it?
e.g.
/home/harry/path/of/my/folder

then e.g. type:
ls -al /home/harry/path/of/my/folder

What about .xsession-errors?

Aka Sam; h: /home/harry/path/of/my/folder: Bestand of map bestaat niet
harry@harry-System-Product-Name:~$
harry@harry-System-Product-Name:~$ ls -al /home/harry/path/of/my/folder
ls: kan geen toegang krijgen tot /home/harry/path/of/my/folder: Bestand of map bestaat niet

this is the output i got, how can i find .xsession-errors ?

harry,
that <path/of/my/folder> was just an example for a path.
The path is like an url where a folder or file is located.
So when you say you can't open a folder, you can either investigate it's status via right click and review properties and permissions or type complete path into terminal in order to review permissions there.
http://library.gnome.org/users/user-guide/stable/nautilus-location-bar.html.en

.xsession-errors is a hidden file in your /home directory.
Description #6.6.20
http://library.gnome.org/users/user-guide/stable/gosnautilus-8.html.en
.