Windows Network not recognized

When I run Ubuntu 8.04 in live CD mode it recognizes under Windows Network my other Windows PC's and the respective drives. However, once I install it my harddisk I do not find anything anymore under Windows Network. I looked at the all the configurations I could think of, but I cannot find a difference. Result: from the harddisk installation I cannot access my windows drives which is crucial if I want to continue to work with Ubuntu which I like quite a bit. However, until I can get completely rid off my Windows PC I need the access to the file system.
Can you help?
Thanks
Joe

ProblemType: Bug
Architecture: i386
Date: Wed Jul 30 22:41:48 2008
DistroRelease: Ubuntu 8.04
ExecutablePath: /usr/bin/nautilus
Package: nautilus 1:2.22.3-0ubuntu2
PackageArchitecture: i386
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: nautilus
Uname: Linux 2.6.24-19-generic i686