WINDOWS XP HOME EDITION (SP2) PROBLEM IN ACCESSING RESOURCES & IPC

Hello,
We are a 2 man team with 2 WinXP Home PC's and 1 Windows 98se

I upgraded one WinXP machine to SP2 which "appeared" to be fine. Over the
next couple of days

Now I seem to have a problem accessing our Server (\\xyz) on
machines while logged in as *some* users. I don't have any problem actually
logging on at all (change the pwd on the server and I have to use the new
password to login which then works fine). What I have found is that:


I created a new user on the server ("cw") and am now in the process of
transferring settings across but now another one of my users have had this
"one user/one machine, resource access" problem and I don't know where is it
going to stop!

Should I uninstall WinXP SP2?
Does anyone know why accessing Server resources for certain User/Machine
combinations doesn't work anymore?

Thanks in advance,

Vipul Panchal