Unable to see Ubuntu 11.10 box on network

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http://askubuntu.com – I am a total newbie to Ubuntu. I downloaded and installed ubuntu 11.10 The install went well and I was able to share folders back and forth between windows and ubuntu. However, the ubuntu box froze and after a reboot would not bring me back to the ubuntu desktop, all it gave me was a blank screen after reboot with no GRUB either. So I decided to repartition and reinstall. However, now I cannot see the ubuntu box in the windows workgroup on my XP box. I also cannot see the ubuntu box under the Browse Network on the ubuntu box itself. Sharing on the ubuntu box should be enabled as I right clicke (HowTos)