slow .doc & .xlr file open w/enable netbios over TCP\IP checked

Here goes: I have 3 computers networked. Everything was fine and normal. Just recently on my machine, I noticed that my .doc files and .xlr files on my machine in "My Documents" or on my "Desktop" would open slow (15-40 sec.). After countless research, and trying many things to correct this issue I noticed that when I go into my internet connection and disable the "Netbios over TCP\IP" in the WINS tab, everything goes back to normal, but now the other 2 machines cannot access my files.

I leave my Netbios disabled because I can still share with the other machines.

Strange, that when Netbios is enabled it would appear that it is checking something over the Network prior to opening the files. Does anyone know why this is happening or how to correct this?

It is apparent that something has changed on my system, as this does not happen on the other 2 machines.

 

What AV and FW are you running?

 

Sry; Running AVG Free and have the Microsoft Firewall turned on on all machines. Strange thing is that it only affects opening files on my machine. the other two are also running AVG Free as well as the Microsoft Firewall turned on but can access there files on there machines with no problems(i.e.: no delay)

NOTE: XP Pro on 2 machines (both on hard wire cat5 to router) and 1 machine running XP Home (connected by WIFI to router)