funky network connections

[Capm]

I've got 2 this time -
I believe both to be software related, but all settings are right, lspfix finds nothing, but my laptop can hook into the same equipment and works fine, and I can't for the life of me figure these things out (these are seperate locations, different networks) -

1)Dell Precision 350 - Both onboard and add-in linksys network cards, when hooked to a router (or any network connection) Just sits there "aquiring network address" but never does. Otherwise the machine appears to work fine.

2)Toshiba Satellite Laptop - Establishes connection on both built-in nic and add-in wireless-g card, intermittantly drops the connection, just for a couple seconds, and comes right back.

Both machines are running XP. Any help would be greatly appreciated.

[CDN_Merlin]

1) remove TCP, reboot and readd it.

2) replace NIC drivers.

Remove QOS on both PC's.

[Krom]

Make sure the DHCP service in services.msc is not disabled or showing an error.

[Capm]

okay, the laptop issue was SBC's portal monitor software (guy is mobile alot, has multiple connections) we shut it down and the connection stabilized.

The other place I won't be back to till Monday..

[fliptw]

try forcing the media type of the dell to 10mbps half-duplex, and see if it helps.

if that helps, then check the wiring between the machine and router.