new pc cannot access 2 pc's

[three 0]

k, this is not really a XP problem but i figured i'd get more replies here instead. here's the problem:

 

We have 5 machinese on a small peer2peer network at work. We just purchased a new box and for some strange reason, it's not able to communicate with 2 of the pcs that are on the 10mbps hub. Well..let me show the setup.

 

[ADSL Modem]

|

[Router/Switch]--|-Port1 PC1(Win98)

|-Port2 PC2(Win98)

|-Port3 PC3(WinXP)

|-Port4 [10mbps hub]--|-Uplink Port

|-Port1 PC4(Win95)

|-Port2 PC5(Win98)

 

Ok, the problem is with PC1, It can only ping/browse PC2 & PC3. PC1 shows up in network neighborhood on PC4 & PC5 but cannot ping/browse. With the exception of PC1, the rest of the network is working fine. I have checked the network settings and everything 'appears' normal, so I'm basically stumped at the moment.

[three 0]

it was starting to drive me crazy until i checked the ports on the router, seems that the port it was in didn't like the hub, plugged it into a different port and everything is back to normal.