Issues after upgrading to NIS 2011

same same , since upgrading to NIS 2011 my home network no longer lets me share files, infact i dont even see the computers in the network folders, pc 1 =win7 pc2=xpsp3 ive checked all windows settings, norton see's the xp pc but the file sharing is gone as i no longer see the shared folders, can only blame NIS 2011 as its the only change been made on this computer, btw i can remote desktop to the xp machine, but only for short periods, i cannot remote from xp to 7 machine tho, any pointers appreciated.thanx

 

<<Edit: Subject edited for the moved post to reflect the issue>>