Centos – problems setting up vnc on centos

I am new to using linux and would like to setup vnc – it used to work but I don't know what has happened and now it doesn't seem to be working. Any suggestions would be greatly appreciated. thanks.

EDIT

I have added this to the '/etc/sysconfig/vncservers'

VNCSERVERS="1:admin"
VNCSERVERARGS[1]="-geometry 800x600"

and my /home/admin/.vnc/xstartup file looks like

 #!/bin/sh

# Uncomment the following two lines for normal desktop:
# unset SESSION_MANAGER
# exec /etc/X11/xinit/xinitrc

[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup 
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources 
xsetroot -solid grey
vncconfig -iconic & 
xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" & 
gnome-session &

/usr/sbin/ss5 -m -t &

env LC_CTYPE=zh_TW.utf8 WINEPREFIX="/home/admin/.wine" wine "C:\ \Program Files\\uTorrent\\uTorrent.exe" &

However when I try and connect I get

And the /home/admin/.vnc/inverses:1.log file looks like

Sat Sep 26 17:44:15 2009
 vncext:      VNC extension running!
 vncext:      Listening for VNC connections on port 5901
 vncext:      Listening for HTTP connections on port 5801
 vncext:      created VNC server for screen 0
error opening security policy file /usr/lib/xserver/SecurityPolicy
Could not init font path element /usr/share/X11/fonts/TTF/, removing from list!
Could not init font path element /usr/share/X11/fonts/OTF, removing from list!
Could not init font path element /usr/share/X11/fonts/CID/, removing from list!
Could not init font path element /usr/share/X11/fonts/100dpi/, removing from list!
Could not init font path element /usr/share/X11/fonts/75dpi/, removing from list!
sh: /home/admin/.vnc/xstartup: Permission denied