Vista - Cannot network an XP desktop with a Vista laptop

Hi all,

I received my new laptop this week as well as a wireless router (Linksys 160n), I set it up with my existing XP desktop and all was well. Both computers could see each other and I mapped drive on one that could be accessed from the other.

Two days ago the motherboard on my desktop died on me so I bought a brand new one as well as a new cpu and memory. I installed all the hardware late friday night and yesterday I, of course, reinstalled XP.

Now the XP machine is fine but I can't seem to network the two computers again. Trouble is I really don't know who is the culprit;

- Computers can ping each other
- Both can go online through the routeur
- Both see the wireless printer and use it
- On the Vista laptop if I go to the Network Sharing window and click on Full Map, it sees the desktop.
- Of course both use WORKGROUP for the work group name
-I've tried several ways to share folders and drives on the vista laptop which yielded no results.
-The XP desktop has the fix for the LL something

I am beginning to be at a loss here, any pointers that could help me move forward with this issue?

Thanks,

Phil