samba - Aug 2011 - help with sharing files between windows 7 and linux

Hi list.
I am not very experienced with samba, so would really appreciate some help.

I am trying to share files between my windows 7 host OS and a linux 
guest OS being run by vmware workstation as a virtual machine.
the linux machine I believe is a version of ubuntu lucid.

I was able to share files with no problem between xp and this machine, 
but just can't get it to work with 7.
I am mounting as the super user, I always become root with sudo su 
before trying to mount.
Whenever I try I get the error message permission denied error 13.
I have already tried disabling my firewall and antivirus, antispyware 
technology etc. This hasn't helped.
I have tried to mount using the host name of my computer, and its IP 
address, again no luck.
I can't get smbfs to mount my share either, I know that it has been 
deprecated in favour of samba, but a lot of forums on line seem to 
suggest its more reliable than samba.
thanks so much for any help,
Alex.

The mount command I am putting in is
sudo mount -t cifs //alex/code /mnt/rockbox/code -o 
guest,rw,iocharset=utf8,noserverino,gid=1000,uid=1000,nounix,file_mode=0777,dir_mode=0777