XP - Vista File Sharing

I know there have been many posts on this issue, and I've tried the
troubleshooting tips on many of these, to no avail, so I'm going to explain
my specific situation in the hopes that someone can figure this out.

A few months ago, I purchased a Vista laptop. Up to that point, I'd been
using multiple XP computers on my home wireless and wired network, and have
been able to share files and printers on my main desktop without any
troubles. I still have an XP laptop, and continue to be able to access the
files and printer on my XP desktop without any problem.

The issue is that I cannot see my desktop from the Vista laptop, and have
not been able to access the files on my desktop. I also cannot see the
laptop from my desktop, but since I'm not planning to access files in that
direction (e.g., access laptop files from the desktop), I don't really care
about that problem.

As I mentioned, I've reviewed and tried to follow lots of troubleshooting
advice (example linked below). Example: both computers are using the group
name "MSHOME," file sharing is turned on on the laptop, XP patches installed,
etc. Based on what I've seen so far, it seems like my problem may be on the
XP desktop.

Can anyone suggest any additional troubleshooting steps?

Thanks,
Todd

---------------
URL for recent posting I used:
http://www.microsoft.com/communities...&lang=en&cr=US