Viesta vs. XP

::*good day to you all,*:
::::
::*i have a very strange problem, i have an office loacal networ
between 3 computers 2 xp and my labtop viesta home basic 32 bit,*:
::::
::*i have an 8 port switch , i have a dsl connection so we are no
sharing any hard drives, we only access to each other through the i
address and a password.*:
::::
::*every thing was fine but suddnly one ot the 2 xp computers does no
accept *:
::*the password from my labtop viesta, so the 2 xp computers ca
accesse each*:
::*other ,the viesta can access for one only but the other no.*:
::::
::*i tried ping the ip address for each copmuter it worke
perfectly.*:
::::
::*this problem appeared after i changed my antivirus on viesta fro
kasper to avg*:
::*i removed them but the problem still there.*:
::::
::*i know that somthing is missing and i hope somone can help.*:
::::
::*thanks in advance.*:

--
moosta